U Bolts from a Dakota rear end working on an 8 3/4. Has anyone used this or heard of this.

AMK has the correct u bolts in 2 different lengths. Most of the Mopars that I ever worked on had the flattened gripper u bolts. Hell, I have a couple 38 Plymouths and they used that flat u bolts way back in 1938-earlier even I think. I've seen the housing tubes pinched by round u bolts.