Brake Master Cylinder KitGM Universal / Corvette StyleLeft/Driver Side MountDisc/Drum ApplicationsDual ReservoirDual BailCast Iron1 in. BoreBrass Proportioning Valve JEGS Universal Cast Iron Master Cylinder Kit Features:Disc/Drum Proportioning ValveProportioning Valve Outlet Ports: (2) 3/8 in.-24 & (1) 9/16 in.-18Proportioning Valve Inlet Ports: (1) 1/2 in.-20 & (1) 7/16 in.-24Warning Light Switch Plug Included3 3/8 in. Center-to-Center Slotted Mounting Holes.Fits These Applications:1964-1972 Buick Skylark1964-1969 Buick Special1967-1969 Chevrolet Camaro1964-1972 Chevrolet Chevelle1964-1972 Chevrolet El Camino1964-1967 Chevrolet Malibu1970-1972 Chevrolet Monte Carlo1964-1971 Oldsmobile 4421964-1972 Oldsmobile Cutlass1964-1972 Oldsmobile F851964-1972 Oldsmobile Vista Cruiser1967-1969 Pontiac Firebird1964-1972 Pontiac GTO1964-1972 Pontiac Lemans1964-1970 Pontiac TempestWill also Fit Ford Bolt Patterns