Genuine OEM Volkswagen Rear Bumper Spoiler, part number 3D5807521ACGRU. This component is part of the rear bumper assembly, specifically a lower spoiler or valance that enhances aerodynamics and appearance. It is supplied in a primer coat (GRU) and requires painting to match the vehicle's color. Genuine OEM parts are manufactured to exact specifications, ensuring precise fitment, correct mounting points, and the factory contour for seamless integration.