The Genuine Volvo Door Mirror Cover - 39821921 is a replacement cover for the exterior side mirrors on Volvo vehicles. It is designed to fit securely over the existing mirror and provide protection from scratches, debris, and other damage. The cover is made from high-quality materials and is an exact match for the original mirror cover, ensuring a seamless and professional look. It is an essential component for maintaining the appearance and functionality of the side mirrors on Volvo cars.