The Genuine BMW Tail Light Bulb With Holder - 63217954459 is a replacement part for BMW vehicles. It is a light bulb that is specifically designed to fit into the tail light assembly of BMW models. The bulb comes with a holder, which ensures proper installation and secure placement within the tail light housing. This product is made by BMW and is an authentic, high-quality replacement for damaged or burnt out tail light bulbs. It is designed to provide bright and long-lasting illumination for the tail lights, ensuring safety and visibility on the road.