Genuine OEM Audi tail light gasket, part number 8K5945191B. This seal is designed to sit between the tail light assembly and the vehicle body, preventing water, dust, and debris from entering the light housing or the interior body cavity. It is a critical component for maintaining the longevity of the lighting electronics. Genuine OEM gaskets provide the exact compression profile and material density required to ensure a reliable, long-term weather-tight seal that aftermarket alternatives often fail to replicate.