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Thinking about changing my stock chrome Z06 wheels to all black or gun metal wheels. Two questions, what are some good replacement brands, and on an '02 Z06 is it possible to increase the size of the wheels to 18" in the front and 19" in the back without issues (scrubbing, loss of ride quality or handling) or should I stick to the 17" in the front and 18" in the rear?
If the wheels are chrome then they are not C5 GM original. GM never shipped a chrome wheel on a C5 (Z or other). They might be OEM wheels that someone sent out for chrome and if so there will be some GM identifying markings in the forging on the inside face of the spokes.. They are perhaps more likely a from China clone/knockoff with chrome.
As far as size (diameter) wheels, you can run (F-R) 17-18, 18-18, 18-19, 19-19, and if your into the 20" wheel thing you can run 19-20. The important thing is to insure that you keep the overall diameter of the rear tires between 1/2" and 1 1/2" larger than the overall diameter of the front tires to avoid TC/AH issues.
The asian knockoffs are going to be the least expensive wheels and the custom forged wheels will be significantly more expensive. You budget will determine what you ultimately purchase.
Understood. They must be polished aluminium wheels that are on the car now.