Dorman W18197 Drum Brake Wheel Cylinder. Fits what vehicles: 1953-1959 GMC 300, 1953-1954 GMC 300-24, 1953-1957 GMC F350, 1953-1954 GMC F350-24, 1953-1954 GMC F350-27, 1953-1959 GMC F370, 1953-1954 GMC M350-24, 1953-1954 GMC M350-27, 1953-1954 GMC S300-24, 1953-1959 GMC S370, 1954-1957 GMC M300, 1955-1959 GMC 350-8, 1955-1959 GMC 370, 1955-1959 GMC FM340, 1955-1959 GMC FM350, 1955-1956 GMC M340, 1955-1957 GMC S300, 1960-1962 Chevrolet C40, 1960-1964 GMC 3000, 1960-1965 GMC 3500.
