1988 rear disc brake upgrade

[eddmann55]

im doing a rear disc brake upgrade on my '88 vert. all the articles say to use a master cylinder from a 1993 cobra or s/c, the rearend is from an '88 t-bird s/c, i have access to a master cylinder from a 1995 mustang gt with 4 wheel discs, will that master cylinder work? also would anybody happen to have an adjustable prop valve they would want to sell?

[wick]

If you are just swapping in the rear and going that route, it is wider than the fox rear.

[eddmann55]

yea i know it's .75 wider each side, but i was wondering if i really need to change the master cylinder, and if i do would a m/c from a 95 gt work?