Genuine OEM Audi Door Sill Trim, part number 420853371C. This trim piece is designed to be fitted along the lower edge of the vehicle's door opening, commonly known as the door sill. It serves to enhance the vehicle's exterior appearance and can also offer protection against minor impacts or scuffs. This part is typically made from durable plastic or metal and is shaped to follow the contour of the body. Genuine OEM door sill trims ensure exact fitment, correct contour, and proper attachment points for a seamless integration with the vehicle's bodywork.