4K0 809 378 D · side member Audi genuine (OEM) part number 4K0 809 378 D, side member. Fitted on (2)MEMBER — pos (17) · PR:5C0,5C2 (KAT430.BIN)MEMBER — pos (24) · PR:5C0 (KAT435.BIN) Open the interactive exploded diagram →