Rear trailing arm to spring plate eccentric bolt. Porsche 911 1974-89  ❭  90133313306

Rear trailing arm to spring plate eccentric bolt - M12 x 1,5.
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Related, superseded, cross reference or alternative numbers for comparison.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