Mike, its out of a 71-73 Cougar XR7. They used the same seat frames and seat tracks a 71-73 Mustangs. It bolts right into a Mustang. It will bolt right into the driver side or passenger side. It was a standard driver seat option on the more upscale luxury Cougars as was a power sun roof. XR7s also had door ajar warning, low fuel warning and console ash tray light. Both of my Mach 1 front seats have the power seat system out of Cougars. To install the switch, you need to partially remove the seat cushion upholstery and install the switch mounting bracket (included). There is a square window in the front of the metal seat cushion frame the bracket (also with a square window) lines up with and the switch wire harness passes through. With the upholstery back in place over the switch bracket, you feel for the square window in the bracket and with a utility knife or razor blade cut an "X" diagonally corner to corner in the upholstery and fold the flaps into the square window. Feed the switch wiring harness through from the front and chrome bezel switch assembly fits right in. I have done this 3 times, twice on my Mach 1 and once on the passenger seat of a 1971 XR7 I used to own. The 12V power feed normally comes from behind the driver kick panel. The power seat feed harness (included with this power seat) plugs into the black yellow dot harness there if you have the convenience group option or your car is a convertible. 71/72 cars with heated rear window defrost also have the black yellow dot 12V feed. If your car doesn't have the black/ yellow feed, you will need to improvise. The ground connection is to the welded in seat platform that the power seat track mechanism bolts to.