According to the Chevrolet Master Parts Price List catalog, the doors are the same for 36 (low roof-Second Series), 37 and 38, The 36 low roof Second Series is the cab that resembles the 37 and 38 cab. I do know that at least one thing that is different about the 36 doors is the Door Check. On a 36 the door check is a leather strap, while on a 37-38 it is an in-the-door part. That will cause a mismatch on the inside door panel inside the truck. That's the only difference I'm aware of.
According to the price listing, the cost of a new door was $20.00.
