I have one pair new and another pair used in like-new condition. These are red polymer frame, black shiny cones ADS unmarked woofers/midbass. These would be largest size woofers that fit C5 body (1998-2004 A6, S6, RS6, Allroad). It is a somewhat tight fit, but they definitely fit into the door panels without modifications. I had one pair installed in my front doors and sound difference comparing to stock speakers is very noticeable. These speakers are 2 Ohm DC resistance, have huge magnets and are not only very efficient and loud, but force your head unit to produce higher undistorted power due to low impedance. I am asking very moderate $50/pair for the used, and $70 for the unused pair, plus actual shipping cost from Arlington, VA, or local pickup. They will work with both Bose and non-Bose cars, with or without navigation. Send a message if interested.

 

could you post pics of them installed?