I have 12" Corvette brake kit for 84-87 for sale. Includes 4 brackets, 4 wheel spacers, and the bolts for both front and rear. Originally I paid $300 for the kit. I'm asking $200, plus shipping. You will need at least a 16 inch wheels. I bought the kit from Haus of Guru on Pennock's Fiero forum back in 2012.
If you have the time and are willing to come to Lexington, SC, I have new front spindles (grounded down) with new wheel bearings, and 4 drilled Raybestos brake rotors. I am also willing to part with the 4 brake calipers from my 88 Formula. The kit is currently installed on my Indy, but was never driven as my Indy was my project car. I'm asking $250 for all of these parts.
If you come and get the whole kit, I'd take $400.