Genuine OEM Audi Door Upper Window Guide Strip, part number 4N0837643BT94. This strip is essential for guiding the window glass smoothly and quietly within the door frame during operation. It is installed on the upper section of the left front door. The strip features a satin black (T94) finish. Opting for a genuine OEM guide strip guarantees the correct dimensions, material flexibility, and precise fitment for optimal window function and noise reduction.