I just picked up a set of seats from an 03 V6 car. The adjustment motors/wiring are probably the same. The only input mine has on the bottom is a single, 4-pin plug. Here's a general layout:
Pin 1: | Pin 2:
Black | Brown w/blue stripe
Pin 3: | Pin 4:
Green | Green
I tested the pins with my multimeter. Pin 1 and Pin 3 are for the power adjustments (all of them). Pins 2 and 4 go to the seat belt buckle lock for the "plug your seatbelt in you idiot" light on the dash. I just cut the wires off the back of the plug for Pins 1 and 3 and put on some spade connectors. My car has power lumbar, so I'm going to hack off that plug and put on the female spade connectors and plug it all in that way.
I do plan on extending the wires on the female side as the wiring harness on the seat is pretty hard to work around. There isn't much slop in it. If you want, I'll post up pictures of what I did after I've confirmed that they fit and work. Not sure when you're looking to install them though. I'm going to try to get mine in either tomorrow or this weekend.
1993 Mustang GT - Sloppy Horse - SOLD
1994 Mustang GT - Dedicated Racear - Full MM catalog with 03 Cobra IRS - Codename: Rigid horse