I have a question. Like many other vehicles, Audi 80 B4 Limo and Avant also have a combined brake-light. It’s called a two-string bulb. It’s possible to change the specific thing in the Avant that you have a bulb for brake and final light. Personally, I find it just safer when it’s separated. It’s just better to see for the rear man. I would also use a reasonable solution for a third brake light. Unfortunately, I found nothing more useful.