'75 rear bumperettes -what fits?

Confirmed with PO. They were from a Swinger
So, this is Duster and Swinger rear guards side by side. The part that goes up over the bumper is a bit larger for the Duster and the contour over the bump is a little different. Second pic is what the Swinger guard looks like in position on Duster bumper. This is actually seated in the mounting holes.


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