E Roc,
This conversion will require door panels, but unfortunately it is a little more involved than that. You will need to find a donor car and take wiring harnesses, relays, fuses, window and door lock motors, and switches out of it for transplant into your car. It might actually save you a ton of time and frustration to just completely swap the doors out for power equipped units.
Currently I don't believe that there is any company offering a kit for the 95-98 body style. There is a nifty kit for Fox body Mustangs...but that doesn't help.
I really don't believe that the wiring is already there, but I could be wrong. If there is wiring it would most likely
be located in the front kick panels or fenders and would be a pigtail until that would plug into a door with the power accessories.
I'm headed out to the salvage yard today. I'll take a look and see if I can discover anything further regarding the wiring.
Best of Luck!