Everything but the window grid and purple wire that runs in the wire tray is already in the dash IP harness. All you need is the switch, relay, rear window with grid and the purple wire. Then it's just plug and play.
Wndows can be found at the salvage yard. Eunan (john007) and I pulled one from a Camaro about six months ago. It took about an hour of cussing on a very hot day, but we popped it out. The salvage yard didn't charge much either but we had to pull it. The key to getting a window is to make sure it's not scratched and it has the wire ends attached. Sometimes the wires get cut and you might as well pass on those. The grids, if broken, can be repaired.
I added one to my four speed.