Now I'm not sure if my spare doors are '52 or '51 . . . so I need you guys to tell me if '54 vent window and door window mechanism will also fit inside the steel shell of a '51 door? Sorry. I'm very new -- and inexperienced about the AD trucks, though I drove one for the Chevy dealership I washed cars and ran errands for in the 60s. Thanks, guys.