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Racing Power Company R3518
Cast iron master cylinder 1" bore & 3/8" 4 ports; Cast iron master cylinder 1" bore and 3/8" 4 ports natural finished deep bore
Racing Power Company R3519
1950-60 mopar single well master cylinder; 1950-60 mopar cast iron master cylinder 1" bore size.
Racing Power Company R3520
Gm 1955-64 master cylinder 1" bore drum/drum; Cast iron gm 1955-64 master cylinder 1" bore 7/16-24 port drum/drum application
Racing Power Company R3521
1970-80 gm cast iron master cylinder 1.25" bore 9 1/16-24 & 1/2-18 port on left side