Just bought a 2007 GC Limited and I am trying to upgrade the factory radio to a double din. It has the premium Boston Acoustics system no Nav. I've already bought the bezel, antenna adapter and the PAC C2R-CHY4 to keep the factory amp for the moment. The problem that i have is that there's and extra plug from the back of the factory radio that does not attach to the PAC C2R-CHY4. I'm trying to figure out what to do with it. Please help!