Master Cyl, P-valve, frame lines, are still all stock. If you want a disc brake you can "try" and find a Lincoln from the early 80's as they did have a 7.5" in a few of them. You can also look for an 8.8" Ford as disc brake conversion's are avalible from a ton of manufactures. I'm not sure about axle width's but you might look at an 88 Aerostar, or a Mustang as I know the 88 up Rangers are 3.5" wider then the stock Mits axle.If you want something really different then look at a 89-96 T-Bird or Cougar as the rear is independent.