They are a different bolt circle, and the general consensus is that eventually, they will cause the studs to break due to the constant stress of being pulled (outwards) on the old cars. Another problem would probably be the offset required to fit the new GTO's. It's a 17X8 wheel with a 48mm offset. The bolt pattern on the new goat is 120 mm, and the old ones are actually 120.65.mm or 4.75". This has been discussed ad infinitum on the LS1GTO forum.
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