I went with these because of the same reason you are looking for them
https://www.roughcountry.com/bronco-sr2-aluminum-rail-52003.html?find=2021-ford-bronco-4wd-784415
https://www.roughcountry.com/bronco-sr2-aluminum-rail-52003.html?find=2021-ford-bronco-4wd-784415
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