which late model master CYL for manual disc brakes?

Hey Guys i still have a manual drum master for my manual disc brakes. 68 barracuda
does anybody know which one i need and if the brkae rod is the same or is there a mod you have to do to make it work?
Right now my brakes are alittle stiff.

IIRC, ask for one for a 1976 Duster or 1977 Aspen with manual disc brakes and you'll get the right one.