You can Install Mercedes Benz W204 C200 C250 C300 GPS navigation If your dash like this

As the video showing, if your dashboard is like this, then you can install this mercedes benz w204 navigation gps unit:http://www.dvdgpsnav.com/mercedes-benz-w204-navigation-dvd-gps-head-unit-8-touch-screen-c-200-180-250-300-350.html