1979 Buick Regal Engine: 4.9L V8;. 1980 Buick Regal Engine: 4.3L V8;. 1981 Buick Regal Engine: 4.3L V8;. 1980 Buick Regal Engine: 4.9L V8;. Part Type: Engine Water Pump Gasket. Water Pump Gasket. Ensure that this part fits your vehicle by entering your vehicle's Year, Make, Model, Trim, and Engine in the Compatibility Table.