You need one for a disc setup , I can't recall which is which but one has a residual valve for one or the other. I used one for a 71 Ford Custom ( Galaxie) it had a larger bore and was a manual disc master cylinder. Worked with 4 wheel discs.
Everything I have read on the swap for the granada brakes recommends a manual disc brake master cylinder. The donor car that was recommended was a 74 maverick or comet with manual disc brakes and rear drums. Or just go to the parts store and order a new one for this model of car.
alright, thanks guys, there was actually an auction on it that ended a little while ago. The reason I was asking was because it was very inexpensive compared to the rebuilt Bendix units.