The older part # subs to the newer stamped ones. Shoup's fuel and utlity steps are still a welded style but the mounting holes may be different. https://www.shoupparts.com/SS270-Utility-Step https://www.shoupparts.com/SS250-Utility-Step Pretty pricey don't know if you can buy just the tread. Maybe the CNH guys can jump in here with the steps that was on the MX that I linked and is also used on the CIH Patriot sprayers swing up ladders. They look like a heavier serrated step but not sure if they are aluminum or cast material.
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JD 8300 step upgrade #1 (pics data warning)
