I'm in the process of changing my LRE from manual to power windows and door locks. I got all of the parts from a 89 Ram 250 Van. I took everything for the windows and locks, including the motors, solenoids, switches, relays and all of the wiring and connectors. All of this stuff cost me around $185 at pick n pull. I did the same thing on my 73 Duster and it turned out great. Good luck on your project.
