Water ingress on 80 Avant

[Audiden]

I have two sources of water ingress on my car.

The first is at the rear and I believe its the tailgate seal... I have a replacement to fit & also the n/s rubber shroud between the body & the tailgate that covers the wiring. These are both straightforward items for me to fix.

If my car is parked facing upwards on an incline during heavy rain, when I move off on to level road water pours in through the n/s a-pillar, which would indicate the rear runroof drain tubes are blocked. Only problem is that I can't locate any!

I've checked other Audi 80's and the tubes are visible behind the boot compartments. There are no such tubes visible in this area on my car & there looks never to have been any present... I've had the sunroof fully open to check for drainage but its difficult to see anything. So does anyone know where I might find them?