This is a genuine BMW moulding for the rear left rocker panel. It is a high-quality replacement part made by BMW for their vehicles. The part number is 51128159377. It is designed to fit and function just like the original part, ensuring a perfect fit and seamless integration into the vehicle's body. This moulding is made of durable materials to withstand wear and tear, providing long-lasting performance. It is an essential component for maintaining the appearance and structural integrity of the vehicle's rocker panel.