The bolts are 9/16"-18. You can get them from RockAuto.
http://www.rockauto.com/catalog/x,ca...,parttype,7680
The wheel center hole is about 3-7/16", which is larger than most other GM 5 on 5" wheels, and the non-Buick GM wheels I have seen didn't have the hole for the locating pin.
Ray
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