I just bought a 2004 A8L and upgraded the MMI to what I believe is a 2010 or newer. My Nav and Sirius XM works great. I want to implement bluetooth. I see modules on ebay, however, they don't specify where it's located nor which module is correct for my car, w/ the upgrade. Which one should I get (model numbers??) Any help would be appreciated. I can do it myself, I just need some guidance from members. Thanks in advance.