Porsche 911 Copper Base Shim w/4.213" ID .030" thick, Set of 6

Porsche 911 copper base shim for Nickies™ machine-in cylinders, set of 6 pcs. 4.213″ ID, .030″ thick. For Porsche 964/993 cylinders with 107mm slip fit case registers; fits slip-fit 104-100/107, 104-102/107, and 104-103/107.