I want to replace my door panels due to the driver's side having a crack at the top edge. I removed the panel and see that it was replaced in 1992 with a cheap plastic piece being used as the upper reinforcement backing. I would like to reuse my chrome pieces as they are all in good shape. It looks like I will have to buy the metal reinforcment strips that are missing. My question is how do those metal reinforcement rails attach to the door and how does the unassembled door panels I am purchasing attatch to reinforcement rail?