Sale is for a pair of vintage new Wheel Cylinders, as pictured.    The industry numbers are 13387 and 13388, which replace GM 5465038 and 5465039.  Cylinder ID is 1".  

Made in the USA and sealed in plastic from new.  

Listed to fit (rear):

1950                Buick 40, all; Buick 50-70 2nd type

1951 - 1964     Buick, all except 40-41-4300 

1965 - 1966     Buick 50-60-80-9000

1967 - 1970     Buick 50-60-8000

1955 - 1959     Chevrolet 1/2 ton truck, except with positraction

1960 - 1964     Chevrolet series 10 truck without leaf spring

1965 - 1972     Chevrolet series 10 truck & Blazer

1967 - 1972     Chevrolet G20 van

1971 - 1972     Chevrolet G10 van with 3000 lb axle

1972                Chevrolet G30 van

1959 - 1963     Olds, all except F85/Cutlass

1964 - 1966     Olds, all except F85/Cutlass, J88, Toronado

1967 - 1969     Olds, all except F85/Cutlass, Toronado

May fit other applications.  Verify suitable for intended use as returns are not accepted.