Total items purchased were the seat track (with 3 motors, etc. ), the switch and bezel for it. Then I bought the one harness that connects to the switch. I made up a metal mounting box (for want of a better term), and a harness to connect the motors to the switch harness. I extended to power supply and ground wires and adapted them to insert into the existing seat heater connector where the 12v + and ground wires were located. I used materials at hand for most everything.
That was about it. I did study the manual for about 2 weeks but it was a lot easier once I started.
Dan