I thought the oem u-bolts were 1/2-20?I dont have side clearance problems. I have hardware length problems. Lol. What i had wld fit, the threads just would not go all the way through the deep nut. And i would prefer tjey do for strength reasons. Heres some pics with them mostly on. No inner hardware yet but its on the way. View attachment 538048 View attachment 538049
5/8x3.5x7.5 seems to fit from your pics
I recently got the Stiffler’s tbars and I am looking into replacing the u-bolts.
Good timing here for me lol.