This product,The Garmin Portable Friction Mount for Garmin GPS Units (010-10306-00, is only suited for some of the small GPS systems. It is lacking a part for any of the c5XX series and cannot be used. Until such time as Amazon carries the other friction base (It comes with the curved arm and ball used to hold the GPS unit) the correct part can be ordered directly from Garmin. It you intend to use this in more than one car the friction mount gives you an easy way to move the GPS system.