Genuine OEM Audi window guide, part number 8K9839439G. This component provides the necessary track and support for the side window glass to ensure smooth, binding-free operation within the door assembly. It is engineered to maintain precise glass alignment and prevent rattles or water leaks. Genuine OEM parts are essential for window guides to ensure the factory-specified material density and surface finish, which are critical for preventing glass scratches and ensuring long-term durability in all weather conditions.