Okay, I'll chime in....since Jamie has so eloquently named me the "vette wheel pimp"!!! Thanks Jamie!!!
Not sure how I came to deserve such a prestigious title because to be honest guys, I have never owned a set of the Corvette Wheels (replicas or real ones) for my car. However, I have done a lot of research and reading up on them, so....
My understanding is that the C5 Z06 18x9.5 (+40mm offset) will fit the rear of our Camaros (with Brembos) without the use of any adapters or spacers. Yes, you will have to clamp back your emergency brake cables, which you will have to do with any 18" or smaller wheel. I'm not sure about the C6 wheels, but I would
assume they would fit too (but I can't guarantee it). And yes, the bolt pattern on these is 5x4.75", and it will fit just fine. The difference is literally .03". If you not comfortable with the bolt pattern, then run some hubcentric rings with the wheels.
This place (
http://www.wheelreplica.com/z06.html) used to sell a 18x10.5 (+53mm offset) that would also fit without any spacers or adapters. As seen here:
http://www.camaro5.com/forums/showthread.php?t=174122
Mlee actually sold a few sets of them, but last I heard they were all gone, and that vendor was not planning on getting any more. I sure wish I would have bought a set of them when they were available!!! Maybe with enough "pressure", that wheel replica place will actually request some more???