I can tell, I don`t know as much about this as trailbeast, but, hardly any of these early A bodies came out exactly the same. I bought a brand new 68 form S fastback in 1968, was my first new car. It window leaked , Chrysler mech. couldn`t stop. The cars were not comp. designed the way cars are now, u may never be able to get it right. I worked on putting my currant 68 fish, (that someone else took apart) for about 3 months off and on. Even elongated the adjusting holes as far as I could, got it about as good as it`s going to get. Do have a small gap at the top of the wing window-about 1/16" think I`m going to do a little rubber work on the seal. If your car has had rear 1/4`s put on it, they may be farther out a hair than normal too. Sometimes u gotta do the best u can.