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The bolt pattern for the 1999 Chevrolet Monte Carlo is 5x115. This is the same pattern that is used on the Uplander and the Lumina.
5x112
5x114.3
8X170mm
5x114.3
Bolt pattern is 5x115. Center bore is 70.3
5 x 110
5 on4.5
5 x 4.75
5x 4.75
5 by 4.5
Bolt Pattern: 5x114.3Center Bore: 71.5Hardware:12x1.50 LugOffset: 34-42mm