Someone school me on 73 Duster rear bumper.

On a ‘73, yes. On a ‘74, nope. ‘74’s had shock mounted rear bumpers. Whole different ball game from a ‘73.
I understand about having to remove or collapse the shock absorbers on a 74 and or fill the rear panel or fabricate brackets. My biggest concern was the gaps at the end. I want to end up with a clean flush mount.
My initial post may have been misleading and for that I apologize. The car is a 74 and I want the clean look of a 73.