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Gearbox mounts
For a replacement bush please use PFR57-122.

This part fits the following vehicles:
Porsche 993 C4/C4S 1995-1998 Manual - Transmission type G64.20/G64.21
Porsche 993 Turbo 1995-1998 Manual - Transmission type G64.51/G64.52
Porsche 964 C4 1990-1994 Manual - Transmission type G64.00/01/02
OEM Part Number: 99337521900
OEM Part Number: 99337502300
OEM Part Number: 96437502301
Click 'Zoom in' for large parts diagram.
Fits to no 1 on diagram.
Powerflex. Replacing your car rubber suspension bushes with Polyurethane Suspension Bushes will give you:
- Better road holding
- Constant steering geometry
- Increased tyre life
- More responsitive steering
- Longer service life of suspension components
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-123
The product you are viewing cross references to these numbers
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
This is an insert to fit into and fill the voids in the original bush OE number: 99337521900 in bracket assembly OE number: 96437502301 found on AWD vehicles.
For a replacement bush please use PFR57-122.

This part fits the following vehicles:
Porsche 993 C4/C4S 1995-1998 Manual - Transmission type G64.20/G64.21
Porsche 993 Turbo 1995-1998 Manual - Transmission type G64.51/G64.52
Porsche 964 C4 1990-1994 Manual - Transmission type G64.00/01/02
OEM Part Number: 99337521900
OEM Part Number: 99337502300
OEM Part Number: 96437502301
Click 'Zoom in' for large parts diagram.
Fits to no 1 on diagram.
Powerflex Black Series - Designed for the Track - Ready to Race - Engineered to be the best.
Powerflex Black Series bushes are manufactured using a 95 Shore A compound to provide maximum control of chassis geometry. This compound can be up to 80% more resistant to load than standard rubber and 25% stiffer than our purple performance material.
If your requirements are purely for the ultimate in handling and chassis performance then Powerflex Black Series are unique, offering the most precise and accurate alignment for your chassis.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-123BLK
The product you are viewing cross references to these numbers
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
For a replacement bush please use PFR57-122.

This part fits the following vehicles:
Porsche 993 C4/C4S 1995-1998 Manual - Transmission type G64.20/G64.21
Porsche 993 Turbo 1995-1998 Manual - Transmission type G64.51/G64.52
Porsche 964 C4 1990-1994 Manual - Transmission type G64.00/01/02
OEM Part Number: 99337521900
OEM Part Number: 99337502300
OEM Part Number: 96437502301
Click 'Zoom in' for large parts diagram.
Fits to no 1 on diagram.
Powerflex. Replacing your car rubber suspension bushes with Polyurethane Suspension Bushes will give you:
- Better road holding
- Constant steering geometry
- Increased tyre life
- More responsive steering
- Longer service life of suspension components
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-123H
The product you are viewing cross references to these numbers
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
This part includes an optional support washer with a built in insert to fit into the voided bush for quick and easy tuning of stiffness levels. This part replaces the original bush OE number: 99337521900 in bracket assembly OE number: 96437502301 found on AWD vehicles.
For an insert only please use PFR57-123.

This part fits the following vehicles:
Porsche 993 C4/C4S 1995-1998 Manual - Transmission type G64.20/G64.21
Porsche 993 Turbo 1995-1998 Manual - Transmission type G64.51/G64.52
Porsche 964 C4 1990-1994 Manual - Transmission type G64.00/01/02
OEM Part Number: 99337521900
OEM Part Number: 99337502300
OEM Part Number: 96437502301
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Powerflex. Replacing your car rubber suspension bushes with Polyurethane Suspension Bushes will give you:
- Better road holding
- Constant steering geometry
- Increased tyre life
- More responsive steering
- Longer service life of suspension components
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-122
The product you are viewing cross references to these numbers
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
This part includes an optional support washer with a built in insert to fit into the voided bush for quick and easy tuning of stiffness levels. This part replaces the original bush OE number: 99337521900 in bracket assembly OE number: 96437502301 found on AWD vehicles.
For an insert only please use PFR57-123.

This part fits the following vehicles:
Porsche 993 C4/C4S 1995-1998 Manual - Transmission type G64.20/G64.21
Porsche 993 Turbo 1995-1998 Manual - Transmission type G64.51/G64.52
Porsche 964 C4 1990-1994 Manual - Transmission type G64.00/01/02
OEM Part Number: 99337521900
OEM Part Number: 99337502300
OEM Part Number: 96437502301
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Powerflex Black Series - Designed for the Track - Ready to Race - Engineered to be the best.
Powerflex Black Series bushes are manufactured using a 95 Shore A compound to provide maximum control of chassis geometry. This compound can be up to 80% more resistant to load than standard rubber and 25% stiffer than our purple performance material.
If your requirements are purely for the ultimate in handling and chassis performance then Powerflex Black Series are unique, offering the most precise and accurate alignment for your chassis.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-122BLK
The product you are viewing cross references to these numbers
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
This part includes an optional support washer with a built in insert to fit into the voided bush for quick and easy tuning of stiffness levels. This part replaces the original bush OE number: 99337521900 in bracket assembly OE number: 96437502301 found on AWD vehicles.
For an insert only please use PFR57-123.

This part fits the following vehicles:
Porsche 993 C4/C4S 1995-1998 Manual - Transmission type G64.20/G64.21
Porsche 993 Turbo 1995-1998 Manual - Transmission type G64.51/G64.52
Porsche 964 C4 1990-1994 Manual - Transmission type G64.00/01/02
OEM Part Number: 99337521900
OEM Part Number: 99337502300
OEM Part Number: 96437502301
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Powerflex Heritage Collection. For Modern Day Classics.
A range of bushes engineered for the road to compliment your classic car.
POWERFLEX Heritage Collection bushes are manufactured using modern day materials with properties biased for the road. These dark grey coloured bushes will improve any collector's car, whilst retaining the same standard appearance of a rubber bush.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PFR57-122H
The product you are viewing cross references to these numbers
- Porsche 964 (911) C4 1989-93
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
Porsche Gearbox Mounts
At Design911, we supply a wide range of gearbox mounts for Porsche models, from OEM-style replacements to uprated performance mounts that help control drivetrain movement and keep your Porsche feeling precise and responsive.
Why do Porsche Gearbox Mounts matter?
Gearbox mounts sit between the transmission and the chassis of your Porsche, supporting the weight of the gearbox and controlling how much it can move under load. As rubber ages or higher demands are placed on the drivetrain, standard mounts can soften or crack, allowing excess movement, extra vibration and less consistent shift quality. Replacing tired mounts or choosing a suitable performance option helps restore a more connected feel and protects surrounding components from unwanted movement.
- Keep the gearbox properly supported and aligned under normal driving and acceleration
- Help manage vibration and harshness so your Porsche remains refined in daily use
- Reduce unwanted drivetrain movement that can contribute to shunt, knocks or vaguer shifting
- Support long-term driving enjoyment and can complement other chassis or transmission upgrades
Common options & kits
Individual replacement parts – Specific gearbox mounts or inserts to address a particular worn component without changing everything at once.
- Ideal for targeted repairs
- Lets you replace only what is needed
- Helps keep initial costs under control
Matched sets or pairs – Components supplied together so related mounts are renewed at the same time.
- Consistent feel and behaviour across the drivetrain
- Helps avoid uneven wear or mixed characteristics
- A sensible choice for routine maintenance
Complete kits – Grouped parts designed to refresh a whole mounting arrangement in one go, useful for more involved upgrades and restorations.
- Everything specified in a single package
- Saves time compared with sourcing parts individually
- Ideal when upgrading or restoring your Porsche
Brands available in this category
For this category we stock a wide choice of trusted brands for Porsche models. You can also browse and filter by brand on this page to focus on your preferred manufacturers.
9products – Precision-engineered performance components for Porsche driveline and chassis applications, including solid and semi-solid mounts aimed at drivers who want a very direct connection and track-capable hardware.
Eurowise – Parts developed with off-road and durability-focused use in mind on certain Porsche models, typically chosen where extra robustness and control are priorities.
OE Match – OE-equivalent components aimed at maintaining original behaviour and refinement, a good fit when you want stock-like feel and sensible running costs.
Powerflex – Polyurethane solutions in areas where they apply, chosen when owners want firmer control and longer-lasting material than ageing rubber, with the trade-off of a more direct feel.
Prekom – Stock-replacement steering and suspension specialists with OEM links on various Porsche parts, useful when restoring predictable, factory-style behaviour.
When should you review or replace your Porsche gearbox mounts?
Checking gearbox mounts regularly helps you spot wear, damage or age-related deterioration before it affects refinement or leads to further issues elsewhere in the drivetrain or exhaust system.
- Clunks or thumps during gear changes, on/off throttle, or when taking up drive
- Increased vibration through the cabin or a more “droney” feel than before
- Drivetrain shunt, judder, or a less precise, more inconsistent shift feel
- Signs that the gearbox is sitting low or has shifted position, sometimes linked with exhaust or heat shield contact noises
If any of these apply, it is a good time to review your gearbox mounts and replace anything that is past its best so your Porsche stays dependable and enjoyable to drive.
Explore Porsche gearbox mounts with Design911
Browse gearbox mounts for Porsche at Design911 — from individual replacement mounts to complete performance-focused solutions — and find options to suit everyday maintenance, subtle upgrades and full projects.