Genuine OEM Audi Sunroof Glass Stop Buffer, part number 4F0877665. This small but essential component is designed to prevent the sunroof glass panel from over-extending or impacting the frame during operation. It ensures smooth, controlled movement and proper alignment of the sunroof. Positioned within the sunroof mechanism, it acts as a critical stopping point. Made from resilient rubber or similar dampening material, it absorbs impact and reduces wear. Using a genuine OEM buffer guarantees precise dimensions and material properties, crucial for the reliable and quiet operation of the sunroof system.