That’s an older Skyjacker Rock Ready subframe and arms. They came with the rod ends (Heim is a brand of rod end) at both ends of the arms (third pic). Looks like a PO swapped a Johnny joint at one end (fourth pic). IIRC they are a 1.25” threaded shank. I had the kit on a previous XJ. Looks like the trans was dropped quite a bit from original as well. The crossmember usually sits about 2” higher.