I got my replacement from Spartan. I was told by them that if I put a couple of dots of clear silicone sealer on the rim it would keep it from popping off again. Plus it would not be hard to get off if needed.
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS