Whirlpool Part Number 4171555: Bumper. Lower Rack BUMPER Works with the following models: Whirlpool 4KUDC220T5, Whirlpool 4KUDI220T1, Whirlpool KGRT500FAL2 Whirlpool KGRT500FWH2, Whirlpool KPDI620T5, Whirlpool KPDI620T6, Whirlpool KPDJ630Y0