Brain fart. 2" mounting width. Durrrr.
I assume with 2" joints these are for uppers. You'd be fine with smaller tube. Currie uses 1"x.156" wall DOM on all their arms, upper & lower. But if it were me, I'd still use the 1.5" on the lowers, they're wider & shouldn't have a problem.
"Evolution through carnage, the Jeep will keep what it needs."