1. The allroad is bascially an A6 avant with bells and whistles.
I believe the dash is the same asl Audi's with the symphony sound system.
2. I specifically asked crutchfield about A6's and they said they did not have a harness. But I will try them again with the suggestion about asking about the Bose system.

3. The only reply I got on audiworld.com was from a guy who said I HAD to replace everything, not just the head.

I will try the suggestions in the past few messages and post here when I have a clear picture.

thanks all,
-amol