Purple Anodized Shim
 

Where could i find a purple non-conductive shim for a AMD Thunderbird?

SHIMS ARE GAY!

In a more technical and mature post:

Shims are evil cause they will more likely cause you trouble with your CPU than help it. Becuase Die's are not the same depth from each chip they core may be slightly higher or lower. Also the shims are not perfect, they claim high tollerances, but I have seen a few of these... there is no precision work going on wiht those...

You can use them, but they are a false sense of security.

Well I got the point across more or less :).