I am in UK and my Honda CRV has the original factory GPS / Stereo unit which I hate. I want to replace it with a more modern system that can actually read my phone address book. Problem is my local Halfords who fit these systems say they won't touch it as they can never find the amp. Unless I can tell them where the factory amp in my CRV is they won't replace it (and I am clueless so not trying to do it myself). Anyone have any idea what I can tell them?