Radium Engineering Rear Clamshell Shim Kit – Lotus Exige

This Radium Engineering kit replaces the factory steel shim spacers found on the rear subframe of the Lotus Exige. Designed for enthusiasts who frequently remove the rear clamshell, this solution provides a lightweight, secure, and reusable alternative that eliminates the frustrations of the OEM taped-on stack.

Vehicle Compatibility:
Lotus Exige (All variants using rear subframe-mounted shims)

Overview:
The factory shim stack is prone to misalignment, adhesive failure, and loss—especially during clamshell removal. This Radium kit resolves these issues by replacing the factory shims with laser-cut aluminum versions, permanently secured using stainless hardware and pinch nuts. The anodized finish not only reduces weight by 73% compared to stock but also protects against corrosion.

Key Features:

• Replaces OEM taped steel shims with a bolted-in solution

• Maintains body alignment without risk of shim movement or loss

• Reduces total shim weight by 73%

• Black anodized finish for corrosion resistance

• Includes detailed instructions for clamshell removal and streamlined future servicing

Materials & Construction:

• Shims: 5052 aluminum, laser cut and black anodized

• Hardware: Stainless steel countersink screws and conical locking nuts

• Finish: Media blasted for clean, durable appearance

Installation Notes:

• Initial removal and installation time: 1.5–2 hours

• Optional modifications detailed in manual reduce future removal to under 10 minutes

• Thickness may differ slightly from OEM stack, but no impact on fitment has been observed