Everything inside currently-equipped power window doors including the switches + the harness that crosses below the dash. It is reasonably easy to do but time consuming, particularly drilling out the riveted-on regulator and fishing all the wires. Otherwise it is virtually plug-n-play. Most late 70s - 80s RWD two-door cars will fit. I put a pair in an Elco from an '80 Grand Am RWD and it fit perfectly. You use your original door glass.