Cliffman,
The plug that the joystick controler plugs into is mounted behind the door panel about 4" to 6" below where the joystick mounts. You'll need to remove the top mounting stud on the mirror base and replace it with a bolt to get clearance for the back of the joystick. The wires on the '03 mirrors will need to be extended by about 14" and you'll need to play around with which ones go to which ones. I had a copy of both the '01 and '03 wiring scamatics to help with this part.
BTW, I'm the friend that Scott mentioned.
Kevin