Part Type: Engine Water Pump Pulley. 1991 Buick Riviera. 1992 Buick Riviera. 1993 Buick Riviera. 1995 Buick Riviera. Oversized Pulley: No. Manufacturer: Dorman. To confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in theCompatibility Table.