I'm looking at replacing the original Symphony II in my 2004 A3 with an updated Symphony Unit which has the chrome dials and MP3 compatability (it's come from a 2007 S3). I know I'll need to buy a quadlock adaptor however my car has BOSE fitted and I want to make sure I'll not lose any of the BOSE features.

Can anyone point me in the right direction for both the correct Quadlock connector and the best place to buy it?

Many thanks in advance.