The Genuine BMW Bulb Socket Side Marker Light - 63117204273 is a replacement part for a BMW vehicle. It is a socket that holds the bulb for the side marker light, which is a small light located on the side of the car. This socket is designed specifically for BMW models and is made with high-quality materials to ensure durability and proper functioning. It is an authentic BMW product, ensuring a perfect fit and reliable performance. This bulb socket is essential for maintaining the visibility and safety of the vehicle on the road.