375539MCK master cylinder rebuilding kit
fits in most cases:

1957-59 AMC

1957-59 Buick

1956 Cadillac

1958 Cadillac with 4 hole reservoir cover gasket instead of 7 hole reservoir gasket - no additional charge - buyer must specify change of gasket for this application

1954-58 Chevrolet

1958-59 Edsel

1954-57 Hudson

1953-60 Lincoln

1955 Mercedes Gullwing (early)

1953-58 Mercury

1954-57 Nash

1953-59 Oldsmobile

1952-56 Packard

1953-58 Pontiac