I lost one on the driver's side. I think the occasional diesel fuel spill affected the adhesion. I bought a safety tread at Lowes that was bigger in dimensions than the one on the Sprinter step, made a cardboard template and then trimmed the tread to size. The new one has a yellow stripe along one edge, which is okay.
Item # 96650 Model # 67304
SKID GUARD 6-in x 2-ft Black with Reflective Stripe Tread Strips Anti-Slip Tape
https://www.lowes.com/pd/SKID-GUARD-...p-Tape/3185621
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