Genuine OEM Volkswagen Front Left Door Window Channel Guide, part number 1K5837431E5AP. This channel guide is installed in the front left door frame, providing a smooth and stable path for the window glass as it moves up and down. Made from durable black (5AP) material, it weighs 1.351 kg. Using genuine OEM window guides ensures precise dimensions and material quality, which are critical for preventing window binding, excessive noise, and premature wear of the window regulator.