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- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
Restore secure damper mounting and precise rear suspension operation with this OE Match Rear Shock Absorber Supporting Top Mount. Designed for compatible Porsche applications, this mount provides the upper connection between the rear shock absorber assembly and the vehicle's body or chassis.
Fits:
For Cars with Standard Chassis (I029)
Porsche 997 C2 / C2S / C4 MKI 2005-08 COUPE / TARGA
Porsche 997 C2 MKII 2009-12 COUPE
Porsche 997 C4 MKII 2009-12 COUPE / TARGA
Diagram Ref No 2
The rear shock absorber controls suspension compression and rebound as the vehicle travels over changing road surfaces. For the damper to work effectively, it must remain securely located at its mounting points. The supporting top mount transfers suspension loads into the vehicle structure while helping isolate vibration and unwanted harshness.
Constant suspension movement, road impacts, heat, moisture and age can cause the original mount and its isolation material to deteriorate. Once excessive play develops, the shock absorber may move at its upper attachment point, potentially causing knocking noises and reducing suspension precision.
This OE Match Rear Shock Absorber Supporting Top Mount provides a high-quality replacement for a worn, cracked, loose or damaged original component.
What This Product Does:
- Secures the upper section of the rear shock absorber to the vehicle.
- Maintains correct positioning of the damper during suspension movement.
- Transfers suspension forces between the shock absorber and chassis.
- Supports controlled suspension compression and rebound.
- Helps isolate vibration and harshness from the vehicle body.
- Reduces unwanted movement at the upper damper mounting point.
- Helps maintain consistent rear suspension behaviour.
- Supports stable and predictable handling.
- Works with the rear damper and associated suspension components.
- Replaces a worn, deteriorated or damaged original mount.
- Provides an OE-style replacement for compatible Porsche applications.
Symptoms Of Wear Or Failure:
- Knocking or clunking from the rear suspension.
- Rattling over rough or uneven roads.
- Noise when travelling over bumps or potholes.
- Excessive movement at the upper shock absorber mounting point.
- Increased vibration transmitted through the vehicle body.
- Rear suspension that feels loose or unsettled.
- Reduced suspension refinement.
- Visible cracks in the mount's rubber or isolation material.
- Rubber separating from the surrounding mount structure.
- Distortion or physical damage to the mount.
- Corrosion around the mount or mounting hardware.
- Loose or damaged mounting fasteners.
- Wear discovered while servicing or replacing the rear shock absorbers.
Why Replacement Matters:
- The shock absorber depends on a solid and correctly located mounting point to control suspension movement effectively. When the top mount becomes worn, some suspension movement can be absorbed as unwanted movement within the mounting point rather than being properly controlled by the damper.
- This can produce knocking or rattling noises and may make the rear suspension feel less precise. On a performance-focused Porsche, unwanted movement in suspension mounting components can also reduce the consistency of the chassis response during cornering, braking and rapid changes of direction.
- Deteriorated isolation material can allow additional vibration and harshness to pass into the vehicle body. Severe deterioration may also place unnecessary loads on the shock absorber, mounting hardware and surrounding chassis structure.
- A damaged top mount should not be ignored simply because the shock absorber itself remains functional. Both components must be securely connected for the suspension to operate as intended.
- Replacing a worn component with this OE Match Rear Shock Absorber Supporting Top Mount helps restore secure damper location, reduce unwanted movement and maintain predictable rear suspension performance.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99733306100
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
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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)
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- Porsche Cayman S 718 2.5L Manual (350 Bhp)
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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
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Porsche 987 MKII Boxster 2009>>
Porsche 987C MKII Cayman 2009>>
Click 'Zoom in' for large parts diagram.
Diagram ref no 8
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98733330101
The product you are viewing cross references to these numbers
- 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
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
The product you are viewing cross references to these numbers
- 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
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