When I di my 5 lug/Disk brake conversion on my old 89 LX, I used the 15 inch Aluminum wheels from the 94/95 v6 coupes with a light roll of the fenders in the rear and was able to use the 16X7 and the 17X8 without and clearance problems using the "C" code springs from Ford. But I did use the T-Bird Turbo Coupe 8.8 with 3.55 gears and ran 205/45 ZR17 s in front and 225/40 ZR 17 s in the rear. The other BIG difference is that to get the same ofset in front as the rears the SVO cast tubular controll arms are needed and I left mine with the 92 GT Kmember and controll arms. they never rubbedand the car tracked beautifully. If I do the 5 lug /disc swap on the 87, I will probabli use the SN 95 stuff as it is only 3/4 of a inch wider as opposed to the 1 3/8 wider SVO/Lincoln stuff. and for those who want the stock drums, go out and get you a couple of Ranger drums and the left axle from 2 trucks
The SVO / Lincoln Mark VII brake system is comprised of
a master cylinder with a 1.25" bore, 11" vented front disc
brakes, and 11.35" vented rear disc brakes.
The problem with the rear brake setup is that the axles are
1.25" longer (per side) than the stock Mustang axles, so wheels
with a custom offset will be required. That, or live with the wheels
sticking out of the wheelwells.