yes il ask but it was a couple of years back now. You will need a new air con unit as the switches are integrated into them see here for example
AUDI A4 AIR CON CONTROL PANEL on eBay (end time 03-Nov-10 18:46:37 GMT) bit pricey that one. ive also read that a b7 aircon unit (although looks identical to the b6) fits but will need a modification to the wiring loom to make the rear demister work, i think woorlord did a good wright-up on how to do this not so long back, I also believe that kufatec build and supply the wiring looms you need. to connect the seats to the aircon unit.