I just made my own out of tubing that is twice as thick as the factory, I used a Harbor Freight tubing bender to get the bends and then crimped the ends in my press. I also made my jounce bars and fender to core support braces the same way.
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Any chance you'd make a GP bar or two for resale? Let the last one I had go with a wagon I sold about 3 yers ago and have not found one since