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Are you talking about the wheel bolt pattern ?
Great !5 on 4-3/4
Buick - Regal, Century, Special (most mid-size) '64-'80'sChevy vanChevrolet - all (exc as noted elsewhere) '49-'89Corvette allCorvair '65-'69 5-boltGM compact and midsizeOldsmobile - 442, Cutlass, F-85, Toronado(most mid-size) '60's-'80'sPontiac - GTO, LeMans, Firebird, Grand Prix(mid size) '64-'80's
So here is the breakdown, you have 5 x 4.75 inches, or 5 x 120.65 metric.