Radium Rear Clamshell Shim Kit - Lotus Exige (All)Radium Rear Clamshell Shim Kit Lotus Exige (All Years) This kit was designed to replace the factory Lotus Exige steel body shim spacers with a permanently secured, lightweight aluminium alternative. The factory shims are taped to the rear subframe and easily lose adhesiveness and alignment with the four trunk mounted through holes they can slip, misalign, and get lost during clamshell removal. This kit eliminates those problems entirely. Radium shims