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Yes, late model C5 and C6 rims will fit any '88-'96 Corvette without the use of spacers or adaptors. '84-'87 need adaptors/spacers in order to fit properly.
Forum member 88BlackZ-51 just recently installed a set of genuine C5 Z06 wheels (not aftermarket) on his '88 Corvette without adaptors/spacers. He posted a discusstion thread with pics not long ago. Scroll through the first couple of pages to see if you find his thread. Another option would be to perform an advanced search for threads started by 88BlackZ-51.