1967 Dart Convertible Door

How the vent window assembly fastens into the door is different on a 67 door compared to 68 and up. I found this out when trying to put a 68 door on my 67 Cuda. I ended up cutting off the top inner part of the 67 door and putting it on the 68 door, everything else was fine, no problems.

Convertible doors don't really have a second latch, what they do have is a contact block on the end of the door that buts up to a piece in the doorjamb that is supposed to help control body flex, I have seen this on lots of different models and brands of cars.