https://www.ebikemotorcentre.com/product/bosch-gen-2-drive-sprocket-o-ring-part-no-plb00528/
eBike Motor Centre (Performance Line Bearings) - Bosch Gen 2 Drive sprocket O-ring Part No PLB00528
Mar 2, 2026 - Bosch Gen 2 Drive sprocket O-ring, fits behind the sprocket nut of the Bosch Gen 2 motor. Bosch Generation 2 motor BDU2xx...