definitely just go to a junkyard and pull the rear brakes off an sn95 or new edge. You also will need to rear brake lines and a different brake booster with a proportioning valve for the rear discs. I'd suggest swiping all of that off the new car minus the rear brake lines. I'd def buy those new. Since you already have the 5 lug shafts those should work just fine.
The only kit I have really seen for the fox bodies is the cobra kit but I'm pretty sure those are around $1000 which was always a little rich for my blood lol.
Torque: It's like crack for your right foot