Eliminate vent windows?

Duster/Demon/Dart Sport and Dart door shells are the same. But Duster/Demon windows will NOT fit a Dart, the window is a completely different shape.

You also can't just swap in the later glass. The later model glass without the wing vents also uses different regulators and hardware, and it mounts differently. The easiest thing to do would be to find a complete set of '73-'76 Dart doors and just swap them. Your other alternative would be to use your doors, but swap in the windows and all of the regulator hardware from a later car. The only thing about doing that is you might run into interference issues with the door locking hardware, because the later model doors moved inside door handles. That might have been because of the changes to the windows and regulators. Or maybe not, but the inside handles definitely moved in '73. Also, the later doors had the plastic interior panels on the top, so you might not have access to the parts of the later regulator to get everything installed into an earlier door.

Why everyone wants to get rid of their wing vents I don't know. Maybe not the best looking option, but man are they great to use.