BTW, are you certain of the manufacture of those wheels? I checked Cray's website and they only have two models for the C5 Z06 Corvette. Manta and Scorpion. (
http://www.craywheels.com/configurator/index.html). Neither of which looks like the stock Z06 design. Since the wheel caps are interchangeable with stock wheels, are you CERTAIN that you don't just have Cray wheel caps on a different brand of wheels?