The Genuine BMW Additional Turn Indicator Lamp Left - 63137221861 is a replacement turn signal lamp for the left side of a BMW vehicle. It is a genuine BMW product, meaning it is made by the original manufacturer and is of high quality. This turn indicator lamp is designed to provide additional visibility and safety while driving, especially when making turns. It is a direct fit for BMW models and does not require any modifications for installation. This product is made with durable materials to ensure long-lasting performance and is an essential component for proper signaling on the road.