The Genuine BMW Trim Power-Window Unit (Black) - 51417232539 is a replacement part for BMW vehicles. It is a black trim piece that is designed to cover and protect the power window unit in the vehicle. This trim piece is made from high-quality materials and is an exact match for the original piece installed in the vehicle. It is a genuine BMW product, ensuring the highest level of quality and compatibility with your vehicle. This trim piece is easy to install and will help keep your power window unit functioning properly while also enhancing the overall appearance of your vehicle's interior.