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Old 04-29-2008, 10:20 AM
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The bolt pattern for GM wheels is 4 3/4" whereas most of the other makers use a 4 1/2" pattern. To determine what the pattern is you measure from the middle of one hole to the bottom edge of the diametrically opposite hole.

This shows how to do that:
http://www.tirerack.com/wheels/tech/....jsp?techid=92
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