Duster fold down rear seat

Ok, so I grabbed a couple pictures off the 'net and I don't know that your '72 seat bottom will work. At least not with the retractors installed. The notch in the seat is bigger than I remember it being, so the frame is likely different on the earlier versions that didn't have the retractable seat belts.

Giant seat belt retractor
IMG_5180.jpeg

Notch in the seat
s-l1600 (1) copy.jpg

Frame from below
s-l1600 (5) copy.jpg

Earlier seat bottom, doesn't look like there's any notch at all
s-l1600.jpg