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- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
This Eccentric Bolt is an OE-style suspension adjustment fastener used in the rear suspension of classic Porsche 911 models. It connects the trailing arm to the spring plate and allows precise alignment adjustment.
Price is each.
Fits:
Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
Porsche 911 1978-1983 3.0L / SC
Porsche 911 1984-1986 3.2L
Porsche 911 1987-1989 3.2L G50
Porsche 911 1975-1977 3.0L Turbo (930)
Porsche 911 1978-1989 3.3L Turbo (930)
Diagram ref no 25
This OE Match eccentric bolt is a critical suspension component designed to Porsche factory specifications. Installed at the junction between the rear trailing arm and the spring plate, it features an offset (eccentric) cam design that enables fine adjustment of suspension geometry.
The bolt typically measures M12 x 1.5 and is engineered for durability under constant load and stress.
By rotating the eccentric section, technicians can precisely adjust rear camber (and in some cases toe), making it essential for proper wheel alignment. This makes it a key component during suspension setup, maintenance, or restoration of air-cooled Porsche 911 models.
This eccentric bolt allows accurate adjustment of the rear suspension alignment by altering the position of the trailing arm relative to the spring plate. It ensures optimal camber settings, which directly impact handling, tyre wear, and vehicle stability.
Function
• Enables precise rear camber adjustment
• Connects trailing arm to spring plate securely
• Maintains correct suspension geometry
• Helps optimise tyre contact and wear
• Supports stable handling and driving performance
Eccentric bolts are subject to corrosion, seizure, and wear over time, especially due to their exposed position in the suspension. A seized or worn bolt can prevent proper alignment adjustments, leading to uneven tyre wear and compromised handling. Replacing it ensures accurate alignment, improved safety, and optimal suspension performance.
When to replace
• Bolt is seized or difficult to adjust
• Visible corrosion or thread damage
• Inability to achieve proper wheel alignment
• During suspension rebuild or overhaul
• Uneven tyre wear or handling instability
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90133313306
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
This OE match adjustable spring plate is a direct replacement for the original Porsche component used on 911 models equipped with the 915 gearbox. Engineered to original specifications, it integrates seamlessly into the torsion bar rear suspension system. Unlike fixed spring plates, this adjustable version allows precise ride height tuning via an integrated adjustment mechanism, eliminating the need for repeated torsion bar re-indexing.
Sold individually, 2 required per vehicle.
Fits:
Porsche 911 1976 - 1986 915 Gear Box
Replacement for Diagram Ref No.16
Unfortunately, lowering the rear of your 911/912/930 is not nearly as easy as lowering the front. That is until you install this new Adjustable Spring Plate kit Now your rear ride height can be adjusted to your desired level with a simple turn of a bolt.
Note: When using adjustable spring plates with stock torsion bars, the splines may be a tight fit and require a small amount of hand fitting.
Spring plate normally rust, replacing them will give you a better ride.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91133300905
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Sold in sets of (4), enough for both sides of one car.
Fits:
Porsche 911/912/930 ALL 1965-89
Gain back ride quality and rear end stability with High Density Rear Spring Plate Bushings for your 911. Under prolonged use, especially when driven hard, the OEM bushings can break down allowing more slop in the rear suspension. If neglected long enough or driven under heavy load enough, these bushings will eventually deform allowing the spring plate to contact the cover plate. Replacing your factory bushings with our 25% stiffer units will allow full and smooth articulation of the spring plate, thus improving the ride quality and performance of the legendary rear end in your classic 911. Featuring a higher, "sport" durometer these rubber mounts are a great compromise between soft factory mounts and solid/spherical bearings often used to replace them.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90133300309
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 912E 4CYL 1976
The OE Match Rear Spring Plate Bushing Set is a standard-specification rubber suspension bushing kit designed to restore the mounting and movement of the rear spring plates on selected classic Porsche 911, 912 and 930 models.
Includes 4x Standard rubber softness spring plate bushings (w/ 55-60 shore A)Outer dia: 75mm
Inner dia: 48mm
Thicknes: 42mm
Fits:
- Porsche 911 1968-89
- Porsche 912 1968-69
- Porsche 912 1976
- Porsche 930 1978-79
The rear spring plates form an important part of the Porsche torsion-bar rear suspension. They connect the rear torsion bars to the trailing-arm assembly and move as the suspension rises and falls.
Rubber bushings support each spring plate where it passes through the torsion-bar housing and spring plate cover. These bushings allow controlled rotational movement while helping keep the spring plate correctly positioned within the suspension assembly.
Over time, the original rubber can compress, harden, crack and deform. This allows the spring plate to sit off-centre, increasing unwanted suspension movement and potentially allowing metal-to-metal contact between the spring plate and its cover.
Replacing worn bushings helps restore correct spring plate support, suspension geometry, ride quality and predictable rear suspension behaviour.
What This Product Does:
The rear spring plate bushings support the spring plates within the rear torsion-bar suspension.
They are designed to:
- Support the rear spring plates.
- Keep each spring plate correctly centred.
- Allow controlled rotational suspension movement.
- Isolate vibration between suspension and body.
- Reduce metal-to-metal contact.
- Help maintain rear suspension geometry.
- Support predictable rear wheel movement.
- Reduce unwanted spring plate movement.
- Restore factory-style rubber compliance.
- Replace compressed, cracked or deteriorated original bushings.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Rear suspension squeaking.
- Creaking from the rear suspension.
- Clunking over bumps.
- Increased rear suspension movement.
- Spring plate sitting off-centre in the cover.
- Uneven gap around the spring plate cover opening.
- Spring plate contacting the cover.
- Metal-to-metal rubbing marks.
- Rear suspension feeling loose.
- Reduced stability during cornering.
- Changes in rear wheel alignment.
- Uneven rear tyre wear.
- Vehicle wandering or feeling less settled.
- Visible cracked or deteriorated rubber.
- Rubber separating from the spring plate.
- Suspension noise during acceleration or braking.
- Excessive rear suspension compliance.
Why Replacement Matters:
Replacing worn spring plate bushings helps restore:
- Correct spring plate positioning.
- Controlled suspension movement.
- Factory-style rubber compliance.
- Reduced suspension noise.
- Reduced unwanted movement.
- Improved rear suspension consistency.
- Proper clearance around the spring plate.
- More predictable handling.
- Better foundation for accurate wheel alignment.
On a classic Porsche, replacing decades-old suspension rubber can make a significant difference to how precise and settled the rear suspension feels.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91133300900B
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 912E 4CYL 1976
The OE Match Heavy Duty Rear Spring Plate Bushing Set is a firmer replacement rubber bushing kit for the rear torsion-bar suspension fitted to selected classic Porsche 911, 912 and 930 models.
Includes 4x Heavy Duty rubber softness spring plate bushings (w/ 80-85 shore A)Outer dia: 75mm
Inner dia: 48mm
Thicknes: 42mm
Fits:
- Porsche 911 1968-89
- Porsche 912 1968-69
- Porsche 912 1976
- Porsche 930 1978-79
The kit contains four heavy-duty rubber spring plate bushings, providing the inner and outer bushes required for both rear spring plates, together with fitting instructions.
Rated at approximately 80–85 Shore A, these bushes are considerably firmer than the standard OE Match version, which uses approximately 55–60 Shore A rubber. The higher-durometer construction provides more positive spring plate location and reduced unwanted suspension movement, making the kit particularly suitable for fast-road, performance and more demanding suspension applications.
The rear spring plates connect the torsion bars to the rear suspension and rotate as the wheels move through their suspension travel. Rubber bushes support the spring plates where they pass through the torsion-bar housing and spring plate covers.
As the original rubber ages, it can compress, crack, harden and deform, allowing the spring plates to move away from their intended position. Replacing deteriorated bushes helps restore accurate spring plate support, consistent rear suspension geometry and more predictable handling.
What This Product Does:
The spring plate bushings support and locate the rear spring plates within the torsion-bar housing and spring plate covers.
They are designed to:
- Support the rear spring plates.
- Keep the spring plates correctly centred.
- Allow controlled rotational suspension movement.
- Reduce unwanted lateral and vertical movement.
- Help maintain rear suspension geometry.
- Reduce metal-to-metal contact.
- Improve suspension response.
- Support more consistent handling.
- Replace compressed, cracked or hardened original rubber bushes.
- Provide firmer suspension location than standard-specification rubber.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Rear suspension squeaking.
- Creaking over bumps.
- Clunking from the rear suspension.
- Spring plates sitting off-centre.
- Uneven clearance around the spring plate cover.
- Metal-to-metal rubbing.
- Excessive rear suspension movement.
- Rear end feeling loose or imprecise.
- Reduced stability during cornering.
- Changes in rear wheel alignment.
- Uneven tyre wear.
- Suspension movement during acceleration or braking.
- Visible cracks in the rubber.
- Rubber becoming hard or brittle.
- Rubber separating from the spring plate.
- Spring plate cover showing rubbing marks.
Why Replacement Matters:
Replacing deteriorated spring plate bushings helps restore:
- Correct spring plate support.
- Consistent suspension movement.
- Proper rear suspension geometry.
- Reduced unwanted compliance.
- Improved handling precision.
- Reduced suspension noise.
- Proper clearance around the spring plate.
- More predictable rear suspension behaviour.
Choosing the heavy-duty version additionally provides firmer spring plate location for drivers prioritising suspension control and response.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91133300900BHD
The product you are viewing cross references to these numbers