I want to say RockKrawler used to make a lock ring type “johnny joint “ retainer ring like that but I don’t even trust what I am saying- or they may be SkyJacker judging by the use of urethane in one end....an extremely bad idea. SkyJacker is the last brand I ever saw with those.
And look- I’m not trying to criticize or anything, But those things are not even close to worth the time to chase parts, rebuild and bolt back on-
They are an awful design-
If its price, you would be better off with some takeoffs of most any brand on facebook marketplace- even some Rough Country to get it on the road.
I can’t imagine how bad that rig is to ride and drive. There is a world of arms sold by Zone, Core, and many other companies all the way up the food chain to Savvy.
Someone here likely can even hook you up.
Again, not bashing ya man. Really trying to help.