i am looking at either the avic-z120bt or AVH-p5200bt. I have them both coming. The gmos-06 is supposed to work for this. what other plugs do i need in the back of the radio besides antenna adapter? I am also reading that the front speakers will not work as this is the BOSE setup. no onstar. will it work or not? so basically, i want to keep the stock setup and just change the head unit. what is the best mounting kit for these? one is din the other is double din. what is the best approach without changing the whole system?