The Genuine BMW Bulb Holder for the Rear Light in the Trunk Lid is a high-quality replacement part designed specifically for BMW vehicles. This bulb holder is for the left side and has the part number 63217344645. It is used to hold the bulb securely in place in the rear light located in the trunk lid of the vehicle. This part is made of durable materials and is an exact fit for the original factory-installed bulb holder. It is essential for proper functioning of the rear light and ensures that the bulb stays in place while driving. This Genuine BMW Bulb Holder is a reliable and long-lasting solution for maintaining the safety and functionality of your vehicle's lighting system.