Dang U-bolts!
I reused the ones on my truck.
my old trash truck (5ton+) had the same bolts off and on so many times to change the overloads
it's mild steel, soft, forgiving, it has to be, it can be heated red hot, very little strength is gone
I made my own because a for 5 ton truck w/ 16-20" bolts was stupid $$$$
took a week, after workc 1/4 turn to cut, 1/4 to clear chip. figured in '92 i made $75/hr drinking beer at the vise when it was done
10" long on each side of a 1" mild steel rod/bar stock. then we heated it and bent it over a piece of pipe
people so over thinking stuff sometimes