I agree with the other posts that there is no bolt on upgrade. The rear disc I used was off a 90 lincoln town car. If you can handle turning a wrench it is an easy swap. Take an old town car, marquis,or vic and take the whole nine yards off the back of that car as far as pads, rotors, knuckles, and calipers go. Yes you will need to weld 8 holes and drill 8 holes.kind of a no brainer, if not get a welder to weld the holes and i hope to god you can use a drill. This set up gives you a park brake and a big disc. I have used it for 6 years now. no problems.
Any other questions?