Is the cap flange supposed to go under the nuts? If yes, the rears should be fine. Not sure about the fronts, because the Buick hubs stick out pretty far. It would depend on how deep your caps are. If you run into any interference with the wheel locating pin, just remove the pin (it unscrews).
The normal type of chrome lug nut covers will work with the Buick bolts. I believe the hex size is 13/16", but you might want to measure one of the bolt heads to be certain.
Ray
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