My car isn't full on pro-touring, but it has some of the goodies that would be considered aimed in that direction. I'm in the process of finishing up Air Ride on the car so that will be interesting to compare to my previous setup. There are a ton of vendors out there that sell great suspension products for these cars.
Here are just a couple that I can think of off of the top of my head.
For the rear
Steeda offers their 5-Link rear which seems to be a nice piece.
Maximum motorsports offers everything from lower control arms (I have their LCA's and I'm very happy with them) to torque-arm setups, panhard bars etc.
For the Front
Maximum Motorsports as well as many other companies offer coilover kits
Steeda offers their X2 balljoints which correct some of the geometry issues that come about when you lower a fox body.
Many companies offer bumpsteer kits to tune out the bumpsteer after lowering
Caster/Camber Plates for better alignment adjustability
Probably the first change that I would suggest is to update everything to the SN95 platform. If you do this, you will have unlimited options for braking and wheel selection. If you do this, be sure to get the spindles off of a 94 or 95 mustang (V6 or GT - doesn't matter). The '96 and newer spindles will increase the front track width. You can then use any of the factory Ford brake upgrades - ie: Cobra, Mach 1, Bullit (these are essentially the same thing - dual piston PBR's and 13" rotors).
On the rear you can swap out your axles for SN95 (this will increase the rear track width by .75") and use all SN95 brake bracketry and parts. I chose to keep my stock rear track width (FMS axles) and bought the bracketry to adapt the newer model cobra brakes from
www.northracecars.com
I could go on for pages. If you have any questions about the specifics of suspension swap/conversion, drop me an email and I can point you to some sites that are very specific with what you need. I basically recreated the FMS M2300K kit, but much less money and I retained my factory rear track width.
General Information:
This guys site has a plethora of great information!
http://mjbobbitt.home.comcast.net/mustang/5lug.html
Here is where I got my rear brake bracketry
http://www.northracecars.com/
Here are some details about what I've done with my car. Like anything, if I started from scratch again, I'd probably do a few things differently, but up to this point, I'm very happy with the car. I'm looking forward to testing the Air Ride out when the weather clears up.
Info on my car:
http://www.musclerides.com/Pages/Mem...4mustang_1.php
http://www.wiedos.com/
http://www.wiedos.com/89_Mustang/89_Mustang.htm
Well, that was long and drawn out, but I hope some of the info is helpful.
Brandon