I just bought a 15 Cruze LT, with base green display screen. I would like to add MyLink to the car to add backup camera and make it look as factory as possible, but so far I have been unsuccessful at finding all of the information I need. I have found the radio unit and touchscreen display. One dealership told me you can buy the radio unit that was part of a previous 15 Cruze and there wouldn't be any programming needed (seemed questionable). Also, are the harnesses there for the upgrade to MyLink or do those need to be purchased as well? We were told the harnesses are there for us to plug it in, but that also seems a bit off. Any guidance on this upgrade is very appreciated.