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Supporting rear suspension top mounts, Set of 2. Porsche 996 - 99633305903
99633305903/1KIT
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 mounts, SET OF 2
Refresh rear end precision and ride comfort with this OE Match pair of rear suspension top mounts for Porsche 996. These mounts use premium rubber and a high-quality bearing interface to control strut movement, cut noise/harshness, and maintain correct geometry under load. Ideal when replacing rear dampers or chasing knocks, creaks, tramlining or uneven tyre wear. Supplied as a matched left/right pair for consistent handling.
Fits:
Porsche 996 C2 / C4 / C4S 1998 - 2005
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 996 GT3 MKI
Diagram ref no 2
Manufactured using high-quality forged aluminium and fitted with durable rubber bushes and ball joints, they ensure excellent suspension response, ride comfort, and long-term reliability. Ideal for eliminating unwanted steering vibration, uneven tyre wear, or suspension noise.
• Position on Vehicle: Rear suspension – both upper shock absorber/strut mount positions.
• Cross-Reference / Alternative Numbers: 2 × 996 333 059 03 (each mounted left & right)
• Applications: Ideal for full rear suspension overhaul where both mounts are being replaced for uniform performance.
Replacing both sides together avoids mismatched performance, where one side’s mount is new and the other is still worn — leading to inconsistent handling, uneven ride feel and asymmetric noise. A full set ensures true rear-suspension balance, restored comfort and dependable stability.
When to replace both:
• One side already shows wear – replace both to maintain symmetry.
• Rear shock/strut replacement performed on both sides – pair with mounts for full service.
• High-mileage vehicle where both mounts are likely nearing end-of-life.
• You want consistent ride and handling across both rear corners.
• To avoid replacing the second side shortly after the first, saving downtime and labour.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99633305903
The product you are viewing cross references to these numbers
Refresh rear end precision and ride comfort with this OE Match pair of rear suspension top mounts for Porsche 996. These mounts use premium rubber and a high-quality bearing interface to control strut movement, cut noise/harshness, and maintain correct geometry under load. Ideal when replacing rear dampers or chasing knocks, creaks, tramlining or uneven tyre wear. Supplied as a matched left/right pair for consistent handling.
Fits:
Porsche 996 C2 / C4 / C4S 1998 - 2005
Porsche 996 Turbo / GT2 2001 - 2005
Porsche 996 GT3 MKI
Diagram ref no 2
Manufactured using high-quality forged aluminium and fitted with durable rubber bushes and ball joints, they ensure excellent suspension response, ride comfort, and long-term reliability. Ideal for eliminating unwanted steering vibration, uneven tyre wear, or suspension noise.
• Position on Vehicle: Rear suspension – both upper shock absorber/strut mount positions.
• Cross-Reference / Alternative Numbers: 2 × 996 333 059 03 (each mounted left & right)
• Applications: Ideal for full rear suspension overhaul where both mounts are being replaced for uniform performance.
Replacing both sides together avoids mismatched performance, where one side’s mount is new and the other is still worn — leading to inconsistent handling, uneven ride feel and asymmetric noise. A full set ensures true rear-suspension balance, restored comfort and dependable stability.
When to replace both:
• One side already shows wear – replace both to maintain symmetry.
• Rear shock/strut replacement performed on both sides – pair with mounts for full service.
• High-mileage vehicle where both mounts are likely nearing end-of-life.
• You want consistent ride and handling across both rear corners.
• To avoid replacing the second side shortly after the first, saving downtime and labour.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99633305903
99633305903
The product you are viewing cross references to these numbers
About kit
This kit is comprised of the following items:
2 x Supporting rear suspension top mount. Porsche 996 (99633305903/1
Price: €169.66
In stock
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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: €16.38
In stock
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- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
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- Porsche Cayman 718 2.0L PDK (300 Bhp)
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Information
Shock absorber top mount rear.
Sold each - 2 required per car
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98133305901
The product you are viewing cross references to these numbers
Sold each - 2 required per car
Fits:
Porsche 981 Boxster / Cayman - 2012 to 2016
Porsche 718 Boxster / Cayman - 2017 onwards
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
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98133305901
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Price: €58.50
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