1973-74 Bumpers.

I would not have Bumper Boyz do them.
What is different between Duster and Dart Sport on the rears? I know the fronts are different.
I'm just going off of the part numbers on the mounts.
I just went out to the shed with the pictures you had online the rear mounts are different going by the bolt holes and the shear size don't look the same mine rear is all Bumper no inside filler or support what ever, the mount differently .