Hi Frank!

In Sweden you can by a dipstick for the gearbox at the Audi-service-station, and it costs about 20 EUROS if I remember well!?

For used parts check at the car-cimitary in your country, it saves you quite a lot if you find any usefull parts;-)

Watch out for the window-controls, by time they will get fatigue and you`ll end-up with broken wires in the door...very-very-VERY expensive to repair at Audi-service anyway.
I had problems with my left-front-door-window, finally it got so bad that you could hear crunchy noises in the door when operating the window, and finally I was unable to lock the window. Audi in Sweden wanted 700 EUROS to repair it, and I said NO WAY! Found a used and tested part at a car-cemetery and I left the car at a local little workstation but handy mecanic I know and including part and job was done it costed me just 200 EUROS!

Good luck!