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Supporting rear suspension top mount. Porsche 996 - 99633305903
99633305903/1
Vehicle Group
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
Information
Supporting rear suspension top mount.
This rear upper shock/strut mount designed for the rear suspension of the Porsche 911 (996) series (1998-2005). This mount positions the rear shock absorber and provides a secure interface between the suspension unit and the chassis. Built to original dimensions and quality standards, it reduces road noise, ensures proper shock alignment and preserves the smooth Porsche ride you expect.
Sold each, 2 required per vehicle.
Fits:
Porsche 996 C2 / C4 / C4S 1998 - 2005
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 996 GT3 MKI
Diagram ref no 2
• Position on Vehicle: Rear suspension – upper mount for the shock absorber / strut (left or right side).
• Cross-Reference / Alternative Numbers: OEM part number 996 333 059 03 (often written 99633305903)
• Applications: Replacement mount for the rear suspension of 996-series Porsche vehicles; used when original mount shows wear, deformation or poor isolation.
The rear shock/strut mount plays a pivotal role in aligning your suspension and isolating vibration. Over time the bonded rubber can deteriorate, the mount flange may corrode, or studs may loosen — all affecting ride comfort and handling. A worn mount can transmit noise and harshness, alter suspension geometry and ultimately compromise stability. In short, replacing a deteriorated mount restores quiet cabin performance and secure handling.
When to replace:
• Noticeable noise, clunks or creaks from the rear suspension.
• Visible cracks in the rubber isolator or separation at the bond.
• Poor ride comfort, increased vibration or harshness.
• Aftershock/strut replacement – when disassembly makes future replacement easier.
• High-mileage or original mount still in service after many years.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99633305903
The product you are viewing cross references to these numbers
This rear upper shock/strut mount designed for the rear suspension of the Porsche 911 (996) series (1998-2005). This mount positions the rear shock absorber and provides a secure interface between the suspension unit and the chassis. Built to original dimensions and quality standards, it reduces road noise, ensures proper shock alignment and preserves the smooth Porsche ride you expect.
Sold each, 2 required per vehicle.
Fits:
Porsche 996 C2 / C4 / C4S 1998 - 2005
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 996 GT3 MKI
Diagram ref no 2
• Position on Vehicle: Rear suspension – upper mount for the shock absorber / strut (left or right side).
• Cross-Reference / Alternative Numbers: OEM part number 996 333 059 03 (often written 99633305903)
• Applications: Replacement mount for the rear suspension of 996-series Porsche vehicles; used when original mount shows wear, deformation or poor isolation.
The rear shock/strut mount plays a pivotal role in aligning your suspension and isolating vibration. Over time the bonded rubber can deteriorate, the mount flange may corrode, or studs may loosen — all affecting ride comfort and handling. A worn mount can transmit noise and harshness, alter suspension geometry and ultimately compromise stability. In short, replacing a deteriorated mount restores quiet cabin performance and secure handling.
When to replace:
• Noticeable noise, clunks or creaks from the rear suspension.
• Visible cracks in the rubber isolator or separation at the bond.
• Poor ride comfort, increased vibration or harshness.
• Aftershock/strut replacement – when disassembly makes future replacement easier.
• High-mileage or original mount still in service after many years.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99633305903
99633305903
The product you are viewing cross references to these numbers
Price: £72.50
In stock
Related products
Vehicle Group
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
- Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
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- Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp) 01/2020>>
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- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 718 2.0L Manual (300 Bhp)
- Porsche Cayman 718 2.0L PDK (300 Bhp)
- Porsche Cayman S 718 2.5L Manual (350 Bhp)
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- Porsche Cayman T 718 2.0L Manual (300 Bhp)
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- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
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Information
Shock absorber additional spring.
The replacement helper spring / bump stop assembly for the rear shock absorber on Porsche 987 Boxster and Cayman vehicles. This bump stop is designed to sit atop or within the rear shock/strut assembly, supporting the suspension’s load under compression, preventing harsh bottoming, and helping maintain ride height and handling balance. Manufactured to match Porsche’s original specification in terms of dimensions and elasticity.
Porsche 987 Boxster 2006 - 2008
Porsche 987 MKII Boxster 2009 - 2012
Porsche 987C Cayman 2005 - 2008
Porsche 987C MKII Cayman 2009 - 2012
Porsche 718C (982C) Cayman 2017>>
Porsche 718 (982) Boxster 2017>>
Diagram ref no 8
• Position on Vehicle: Rear suspension, installed within or adjacent to the shock absorber/strut assembly on the rear axle - acts as secondary support (helper spring) or as bump stop to cushion full compression of the suspension.
• Applications: Ideal when your rear suspension exhibits signs of bottoming, excessive squat under load, or the helper-spring/bump stop is missing, fatigued or deformed - improving ride quality, maintaining correct ride height, and preserving handling performance.
The helper spring / bump stop is a critical yet often overlooked component of the rear suspension system. It steps in under heavier loads, sharp compressions or lowered ride-height scenarios to prevent suspension harsh-bottoming, maintain ride height and preserve handling geometry. When the part is worn or missing, you may experience a harsh “clunk” on full compression, inconsistent ride height, rear suspension instability or accelerated wear of other suspension components. Replacing it restores correct support, prolongs suspension life and ensures your car handles the way it was engineered.
When and why to replace:
• Rear suspension bottoms out prematurely under moderate load or when cornering.
• Noticeable change in ride height, rear sagging or uneven posture under load.
• After replacement of rear shock absorbers or other suspension components where the helper spring/bump stop may have been removed or reused.
• High-mileage vehicle where the original component may have degraded or compressed with age.
• If you have lowered or modified your suspension and want to ensure secondary support matches the rest of the system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98733330100
The product you are viewing cross references to these numbers
The replacement helper spring / bump stop assembly for the rear shock absorber on Porsche 987 Boxster and Cayman vehicles. This bump stop is designed to sit atop or within the rear shock/strut assembly, supporting the suspension’s load under compression, preventing harsh bottoming, and helping maintain ride height and handling balance. Manufactured to match Porsche’s original specification in terms of dimensions and elasticity.
Porsche 987 Boxster 2006 - 2008
Porsche 987 MKII Boxster 2009 - 2012
Porsche 987C Cayman 2005 - 2008
Porsche 987C MKII Cayman 2009 - 2012
Porsche 718C (982C) Cayman 2017>>
Porsche 718 (982) Boxster 2017>>
Diagram ref no 8
• Position on Vehicle: Rear suspension, installed within or adjacent to the shock absorber/strut assembly on the rear axle - acts as secondary support (helper spring) or as bump stop to cushion full compression of the suspension.
• Applications: Ideal when your rear suspension exhibits signs of bottoming, excessive squat under load, or the helper-spring/bump stop is missing, fatigued or deformed - improving ride quality, maintaining correct ride height, and preserving handling performance.
The helper spring / bump stop is a critical yet often overlooked component of the rear suspension system. It steps in under heavier loads, sharp compressions or lowered ride-height scenarios to prevent suspension harsh-bottoming, maintain ride height and preserve handling geometry. When the part is worn or missing, you may experience a harsh “clunk” on full compression, inconsistent ride height, rear suspension instability or accelerated wear of other suspension components. Replacing it restores correct support, prolongs suspension life and ensures your car handles the way it was engineered.
When and why to replace:
• Rear suspension bottoms out prematurely under moderate load or when cornering.
• Noticeable change in ride height, rear sagging or uneven posture under load.
• After replacement of rear shock absorbers or other suspension components where the helper spring/bump stop may have been removed or reused.
• High-mileage vehicle where the original component may have degraded or compressed with age.
• If you have lowered or modified your suspension and want to ensure secondary support matches the rest of the system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98733330100
98733330100
The product you are viewing cross references to these numbers
Price: £14.00
In stock
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Information
Shock absorber supporting mount, rear.
Rear shock absorber supporting mount by OE Match for Porsche 986 and 987 Boxster models and the 987C Cayman. OE reference 98733305900
Sold individually, 2 required per car
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2006 - 2008
Porsche 987C.2 Cayman 2009 - 2012
Diagram ref no 2
What This Product Does
This supporting mount forms part of the rear shock absorber and coil-spring assembly. It provides the upper mounting interface for the damper, helping to locate the assembly correctly and isolate unwanted movement at the mounting point.
Functions
- Supports the rear shock absorber at its upper mounting point
- Helps maintain correct location of the damper assembly
- Connects the rear damper assembly to the vehicle body
- Helps limit movement and noise from a worn mounting point
Technical Details
- Brand: OE Match
- Installation position: Rear
- Quantity required: 2 per car
- Suitable for left- or right-hand rear installation
- Diagram ref no 2
Symptoms of Fault
- Knocking or rattling from the rear suspension over uneven surfaces
- Harsh impacts or increased vibration entering the body
- Loose movement around the upper shock absorber mounting point
- Vague or unsettled rear suspension behaviour
- Premature wear affecting the damper or associated mounting hardware
Why Replacement Matters
A worn supporting mount can allow unwanted movement within the rear damper assembly, resulting in noise and reduced suspension control. Inspection is advisable when replacing rear shock absorbers, particularly if the existing mounts are aged, perished or loose. Related bump stops, dust covers, spring supports and mounting hardware should also be checked while the assembly is removed.
FAQs
- How many mounts are required? 2 Per car. Price is each.
- Should both rear mounts be inspected together? Yes. Checking both sides helps identify uneven wear and supports balanced rear suspension operation.
- Should other components be checked during installation? Inspect the rear dampers, bump stops, dust covers, spring supports and mounting hardware while access is available.
- Is suspension alignment recommended afterwards? An alignment check is advisable following significant suspension work or where uneven tyre wear is present.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98733305900
12-272365
987-333-059-00
98633305903
98633305904
98633305906
48726
The product you are viewing cross references to these numbers
Price: £45.00
In stock
Vehicle Group
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Information
Shock absorber bump stops and dust covers. REAR.
SET OF 4 PARTS
Porsche 987 Boxster 2006-08
Porsche 987C Cayman 2005-08
Porsche 987 MKII Boxster 2009-12 Cars with PASM (M475)
Porsche 987C MKII Cayman 2009-12 Cars with PASM (M475)
Diagram ref no 7 and 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98733330100
The product you are viewing cross references to these numbers
SET OF 4 PARTS
Porsche 987 Boxster 2006-08
Porsche 987C Cayman 2005-08
Porsche 987 MKII Boxster 2009-12 Cars with PASM (M475)
Porsche 987C MKII Cayman 2009-12 Cars with PASM (M475)
Diagram ref no 7 and 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98733330100
98733330100
98633350501
98633350101
The product you are viewing cross references to these numbers
Price: £29.00
In stock
Vehicle Group
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Information
Compensating plate. 3 mm
Rear
Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2005-08
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Old Porsche part numbers:
- 98633350402
- 98733350400
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98633350402
The product you are viewing cross references to these numbers
Rear
Fits:
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2005-08
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Old Porsche part numbers:
- 98633350402
- 98733350400
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98633350402
98633350402
The product you are viewing cross references to these numbers
Price: £15.75
In stock