help on rear brakes

Might be easiest to buy a "brake hardware kit". I got one at Autozone for $8 per axle. It has all the springs and adjusters. It is the "later design", like JimaCuda shows, which would be correct for your Duster. I just had to re-use my spring pins since my rear shoes were a different width. For the later design adjusters, you usually need to press the little stud into a shoe as a pivot for the adjuster. The stud usually comes separate in the brake shoe set. A hammer against a socket works if you don't have a press. Nothing unique here. I expect most cars of that era use the same Bendix drum brake design.