Brought this over from another thread.....
http://www.forabodiesonly.com/mopar/showthread.php?t=203155
I Have always wondered about this but haven't tried it. If this is correct just grab the lower stainless off a 4 door Dart or Valiant and give it a try. Since the glass is a different height those moldings can be had really cheap so there is no reason to pay big bucks. The cowlings show to interchange between two door and the four door Darts so the trim should be the same. Anyone that tries it please post their results for us all to see.