'36 Plymouth coupe rear fenders will interchange with '36 Plymouth 4-door rear fenders and front fenders from a '36 Plymouth coupe will interchange with '36 Plymouth front fenders from a 4-door. If you're asking, will fronts fit on the rear or vice-versa, the answer is no, at least not without a torch, sawzall, hammers & dollies, a welder and a lot of work.............
Front doors will bolt on but the gap across the top will be wide.You will have to add a spacer & shape it to get the proper gap.Jimmie King
i had a '36 sedan that i used for a parts car and the fenders you see on the coupe in my signature picture are from the sedan. no real issues.
Front sheet metal is the same. You can make rear fenders fit with some modifications in thr last quarter of the fender. Doors will fit but will take simple modification at the top rear.