The Genuine BMW Fender Liner Extension - 51718083173 is a high-quality replacement part for BMW vehicles. It is designed to extend the fender liner, which is a protective panel located inside the wheel well, to provide additional coverage and protection for the vehicle's body and components. This fender liner extension is made from durable materials and is an exact fit for specific BMW models. It is an essential component for maintaining the integrity and appearance of the vehicle's fender and wheel well.