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

86 fifth ave is RWD.
Yeah I forgot about those cars. That's those mid sized boxy looking luxury cars with the super fragile rear axle. Well anyway I know the fwd K car mc in my car is not a problem. I've seen plenty of other rwd cars with mc out of Daytonas and other fwd Mopars too. Could be that some fwd mc will not work.