Yes, you can use one from a salvaged car. I'm a member over at
www.feoa.net, (Ford Escort owners association) I'm sure someone over there could give you all the details. I know some of the members there have removed them from salvaged cars and put them on their non c/c equiped Escort. I had an aftermarket Audiovox c/c put on my '97 several years ago and have had no problems with it.