Door glass

I'm not sure what you had in mind, but the Dart hardtop has a vent window and the Duster does not. Besides this, the Dart Sport/Demon/Duster had the same shape glass, but the window crank mechanism changed from 72-73. The later years are a lot different and even some of those years have different mounting locations for the door hardware. The power window kits available out there on the aftermarket are designed for the 73-up doors.(In case anyone cared).