Porsche 911 Copper Base Shim w/4.292″ ID .020″ thick, Set of 6

Porsche 911 copper base shim for Nickies™ machine-in cylinders, set of 6 pcs. 4.292″ ID, .020″ thick. For Porsche 964/993 cylinders with 109mm machine in case registers; fits machine-in 104-100/109, 104-102/109, 104-102.7/109, 104-104, 104-105, and 104-106 Nickies cylinders.