The 3rd brake light on the Avant B5s is made up of tiny little bulbs and I hate them.
They would blow or lose connection and you'd end up with gaps and it looks awfull.
I bought a new unit, stripped it down, fitted some 5mm 12v red LEDs and Pre-Wired LED resister for bulb warning failers.
Put it all together and I got a working LED 3rd brake light with no chance of any missing bit.
|Strip the unit and solder LEDs to each strip. Making sure the + & - is the right way.|