Rear spring plate bushing set (Standard). Porsche 911 / 930 / 912  ›  91133300900B

Bushings Set With Instructions.

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