Here's a link to where I purchased my tail light housings (remember, these come without the bulb holders, your car's original bulb holder slots into these housings: www.aliexpress.com/item/10050...
I had the same generation of A6. In the same colour as yours. I initially bought it's a stop gap, but 6 years later, I still had it. I loved every moment with this car, fabulous in every way, and the engineering, I thought, was second to none. The golden era of Audi.
