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From: Ian Rubrey
As far as I know any 57-59 4 door sedan parts will fit. If you find the donor parts in a salvage yard I think it would be wiser to take the complete doors and then you can transfer the parts into your own doors at your leisure, using the others for reference. Also get a really good wiring diagram. While you have the motors out, take the opportunity to clean out the gears and repack them with grease. It's well worth it.