I came across Ebay and found a Navigation unit (Screen, A/C controls, rear camera, 6 disc changer) and was wondering if it is a simple plug-in-play from the single disc I have now. It came out of a 2007, which is the same year as mine. Can I just swap out everything? Do I need just the CD for the Navigation system? Are ther any extra connectors I'm going to need? Please letme know. Thanks