'74 Dart, 2 door coupe. Plastic caps on top of the door panels. Are they removable/replaceable or part of the door panel? Are they part of a special option package and there are plain panels available with same curvature on top. Anybody make replacements? How about interchange with other models? All but one of mine is busted in some way. The back one's are especially bad. Grandkids are getting scratched climbing in and out of the back seat. Any info is greatly appreciated!