I need a small master cylinder with 7/8" bore

famous bob said
I`ve got 4 wheel disc brakes on my 68 fastback. used the stock splitter, and an 86 diplomat- Chrysler alum master cyl. 7/8 bore, works perfect . (willwoods on the front)

At this point I'd say for certain using the fwd mc is not a problem, at least the one I have. Mine is a K car mc.