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As far as I have heard and seen, the 17" TT2's do not fit. The back sides of the spokes curve very sharply and will contact the caliper of the 13" Corvette front brakes. The 18's I believe clear . . . .
Unfortunately Andy is right. You will have to get spacers, and then you might run the risk of having wheels that stick out of the fenderwell. Just get 18s.