Need some help please. I want to mount a new sat nav on a 2010 GSA using the existing BMW mount which is already on the bike. I believe the Garmin 660 uses the same mount as the Nav IV which I am currently using. Which newer Garmin/BMW sat navs will fit the existing mount. Was planning to buy a Garmin XT but I think it won't fit the mount so what are the options please? Thanks.