[mavala]

You will need the following items:

Audi A4 8E B7 B6 Klimabedienteil + Doppel Din schacht bei eBay.de: Innenausstattung (endet 02.02.08 17:37:45 MEZ)

Or the following if you can re-use your climatronic and you will need a facia plate for the climate control
Audi A4 B6 - B7 - Doppel - Din - Schacht für Navi usw. bei eBay.de: Innenausstattung (endet 01.02.08 21:14:43 MEZ)

and also one of these:
Plug&Play SET VW MFD AUDI SAT NAV CABLE ADAPTER ANTENNA on eBay, also GPS Systems, Navigation GPS, In-Car Entertainment GPS, Cars, Parts Vehicles (end time 31-Jan-08 15:34:08 GMT)

You will also need a navigation CD, which is widely available.
Most people using this type of system also fit a Cd changer as the unit cannot play music CD's. The CD slot is only there for the navigation disc.