Bosch Logo Cover Performance Line (BDU3XX) - Bosch eBike System 2

Bosch O-ring for Bosch Gen 4 (BDU4XX) fits between Chainring Spider and Lockring

Bosch Performance Line Black Logo Cover for Chainring Mounting | Durable OEM

Bosch O-ring for Bosch Gen 2 (BDU2XX) fits between Chainring Spider and Lockring

Bosch O-ring for Bosch Gen 3 (BDU3XX) fits between Chainring Spider and Lockring

KMC ebike Chainring - 21T - Bosch Drive Gen. 2 Sprocket - Wide - 1/2" x 1/8"

KMC ebike Chainring - 18T - Bosch Gen. 2 Sprocket - Super Narrow - 1/2 x 11/128"