I ran into a set of LSR copies once, they took the same ball joint. They were the same in almost every way other than you could tell the finished product was not quite as good, welds, finish ect. and the reinforcement on the lower was slightly different. They were not sport arms like what you have but they were standard travel, the rod ends up the uppers were the same on mine also. I'm confused by the nut welded on because all of my LSR arms were threaded through that whole tube even the copies, I distinctly remember that because I ran the jam nut on the inside so I could get it down to around 46" width. I wish I could remember who I thought made them because I found who I thought it was at the time.
