Folks bought a 71 Demon new back in the day, passenger door rattled something terrible and window was floppy rolled up. We took the door apart and found the rear guide and all the hardware lying at the bottom, guess the line rolled pretty fast back then.

If your Duster is like my Cuda, there's a bracket (part of the door frame) up front with a captive nut. That nut rattled when I closed the door, even after the door was gutted and the screw was torqued down. Car's at the body shop, haven't figured out what to do about it yet. Might be worth a look.