Part Type: Brake Master Cylinder Reservoir Cap Gasket. 1982 Pontiac 6000. 1986 Pontiac 6000. 1983 Pontiac 6000. 1984 Pontiac 6000. 1985 Pontiac 6000. Manufacturer: Dorman. To confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in theCompatibility Table.