What size Ubolts?

not that I would suggest you do this
but
my local autozone has what the call "trailer axle U bolts as well as "lowering" U bolt
these are 3 inches wide and come in a variety of lengths
I may or may not have bought a set of them in 3X10 and used them when I installed my 8 3/4

total cost (for the U bolts) was less than $20.00

I'm sure those don't have the flatted and knurled pads on the upper radius to keep them from crushing the tube, but an option for sure!!