Genuine OEM Audi Rear Tail Light Bulb Carrier, part number 8V3945257A. This left-side carrier is an electrical component designed to securely hold the various bulbs within the rear tail light assembly, providing power and electrical connections. It is located inside the rear tail light housing. Using a genuine OEM bulb carrier ensures correct electrical conductivity, proper bulb fitment, and reliable illumination, which is vital for road safety and compliance.