1983-1985 Buick Riviera V8 5.0L 12si High Output Alternator Pulley:Double V-Belt Pulley This is a direct fit

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This alternator comes with a 56mm pulley in which you can use your stock size belt

This is a direct fit high-output alternator for the 1975-1979 Chevrolet K5 Blazer 6

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1983-1985 Buick Riviera V8 5.0L 12si High Output Alternator Pulley:Double V-Belt Pulley This is a direct fitFitment: This is a direct fit high output alternator for the 1983 1985 Buick Riviera 5. 0L. Being a direct fit, this alternator fits directly into your stock alternator location. Plug: This high output alternator comes with a separate adaptor plug. One side will plug directly into the aftermarket high output alternator, and the other side will plug into the factory plug. NOTE: If you require charging at a certain voltage setpoint, we offer a selection