I think the track bar from the original post is a Rubicon Express track bar.
I have one from Rubicon Express on one of my old jeeps that is identical to that. The bar joint and bolt are the same shape and size. I haven't been able to find it anywhere anymore either. I purchased sometime around 2013 for around 180$. I still have the Rubicon Express sticker that came with it. I assume they don't make it anymore.
