The universal GM brake master cylinder is cast iron made. It is one inch bore diameter type. There are two ports on the left side, which is 9-16" & 1/2". It fist for Disc/Durm or Drum/Drum brake systems. And it is suitable for Buick Skylark, Special; Chevrolet Camaro, Chevelle, El Camino, Malibu, Monte Carlo; Oldsmobile 442, Cutlass, F85, Vista Cruiser; Pontiac GTO, Lemans, Tempest; etc... For the application details are as above:
1964-1972 Buick Skylark
1964-1969 Buick Special
1967-1969 Chevrolet Camaro
1964-1972 Chevrolet Chevelle
1964-1972 Chevrolet El Camino
1964-1967 Chevrolet Malibu
1970-1972 Chevrolet Monte Carlo
1964-1971 Oldsmobile 442
1964-1972 Oldsmobile Cutlass
1964-1972 Oldsmobile F85
1964-1972 Oldsmobile Vista Cruiser
1967-1969 Pontiac Firebird
1964-1972 Pontiac GTO
1964-1972 Pontiac Lemans
1964 -1970 Pontiac Tempest
