I'm rebuilding a master cylinder for a 1969 Cutlass with drum brakes and I can't find a secondary piston for it. The primary piston comes with a rebuild kit but not the secondary piston. Can anyone help me find one?

Here is a pic of it:



According to Rock auto this cylinder fits:

BUICK GRAN SPORT 1967
BUICK GS 1970
BUICK GS 400 1968-1969
BUICK GS 455 1970
BUICK SKYLARK 1967-1972
BUICK SPECIAL1967-1969
BUICK SPORTWAGON 1967-1970
JEEP CHEROKEE 1974-1976
JEEP CJ5 1976-1977
JEEP CJ7 1976-1977
JEEP DJ5 1976-1977
JEEP J10 1974-1978
JEEP J20 1974
JEEP WAGONEER 1974-1976
OLDSMOBILE 442 1967-1971
OLDSMOBILE 98 1967-1969
OLDSMOBILE CUTLASS 1967-1972
OLDSMOBILE CUTLASS SUPREME 1967-1972
OLDSMOBILE DELMONT 88 1967-1968
OLDSMOBILE DELTA 88 1967-1970
OLDSMOBILE F85 1967-1972
OLDSMOBILE VISTA CRUISER 1967-1972
PONTIAC FIREBIRD 1969
PONTIAC GRAND PRIX 1969
PONTIAC GTO 1967-1972
PONTIAC LEMANS 1967-1972
PONTIAC TEMPEST 1967-1970

 

Where did you find the rebuild kit? thanks