75 to 80 Granada are ideal for front disc brake set-ups for the swap over. You will need the spindles, disc's, calipers, and dust shields. You'll need to replace the original Mustang outer tie-rods with ones from a Granada of the same year. Your going to also need a dual chamber master cylinder and either a proportioing valve or combo valve and of course a few new brake lines.

Below are some websites that should tell you everything you want to know, plus the bottom sites have ready to install kits for sale, but are pricey.

http://www.mustangsteve.com/granadadiscs.html

http://www.midnightdsigns.com/james/Disc%20Brakes.htm

http://www.vintage-mustang.com/topic...rumtodisk.html

http://www.discbrakeswap.com/

http://www.chockostangclassicmustang.com/