Buy 2009 Audi A3 Door Seal (Rear, Lower). Rear door. interior trim. Right, Weatherstrip - OEM Audi Part # 8P4867370 (8P4-867-370)

W'strip. Seal.
Rubber Seal around the door frame, aka Weatherstrip. Door Weatherstrip. On body. Surround.

Door Seal

Fits A3