Part Type: Brake Master Cylinder Reservoir Cap Gasket. 1973 GMC P35/P3500 Van w/Vacuum Power Brakes;. 1974 GMC P35/P3500 Van w/Vacuum Power Brakes;. Manufacturer: Dorman. To confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in theCompatibility Table.
