I've read about several different options/opinions about getting a Bluetooth VCIM, but none specifically for a 2007 Escalade. Most of them talk about retrofitting 2007 or 2008 Silverados or Tahoes, but I'd like to see if anyone has a FOR SURE vcim part number that I should be using. Again, I have a 2007 Escalade, fully loaded, with nav and OnStar, but no blue tooth. Also, aside from the VCIM and bluetooth antenna, will I need anything else? Does it automatically use the OnStar microphone? Thanks in advance.