When I go to NAVTEQ Maps – Buy the latest map update for your GPS navigation and choose my information it says that the latest disc is Mercedes-Benz Harman Becker COMAND - North America Map DVD v.10.0 now I know there is another part # there that is not the same as the one I got for my 2007 E63. I was trying to help a friend and he has the S550. So my question is... I have the Mercedes-Benz Harman Becker COMAND - North America Map DVD v.8.0 DVD which in the names looks the exact same... would this work on his 2008 S550? If not how do I know which one to download for the S550?