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personally, if it were me, i would pass. they are not that great of a deal and the wheels are not the same size as the stock Z wheels. the widths are the same as the regular c5 wheels.
The wheels are aftermarket knock offs. You can get them on here from 1 of the 2 vendors selling them at a good price.
The tires. I ran the Sumi HTRZ-II on my C4. In short, they suck. Never could get them to balance right. They flat spot overnight and take some heat to get them to smooth out. In really cold weather they were horrible. Worse than most performance tires are in cold weather. I would never buy them again no matter what they were selling for.