Genuine OEM Audi Door Window Guide Rail, part number 420831619. This component is crucial for the proper function of the power window system, guiding the window glass smoothly and precisely during opening and closing. It is specifically designed for the left-side door. The rail is made from durable materials to withstand repeated use and environmental exposure. Weighing 0.112 kg and measuring 0.415m in length, this rail ensures correct window alignment. Choosing a genuine OEM guide rail guarantees the precise dimensions and material quality needed for seamless window operation and long-term reliability.