Genuine Kohler Replacement Parts for Sterling 5100 & 5900 Series Shower Doors Bushings can be used for the Sterling 5900 Series Doors Bumpers can be used for the Sterling 5100 and 5900 Series Doors. Model Number RPK59/5100-BB Door Series: Sterling 5100 & 5900 Series Doors Content Include: Bumper, Front Bushing, Rear Bushing, Tape and Guide. Part Number: Bumper 1081001(2), Front Bushing 1080397-58 (2), Rear Bushing 1080398-58(2), Tape 676200