I installed the Zumo on my 07. The factory power supply for GPS that is on your stingray does not fit the Zumo. I removed the stingray and wired the Zumo to a switched fuse block (installed earlier). I just zip tied the factory provided wire below the stingray after taping up the contacts. That way, should I ever sell the bike, it is still GPS prepared for a standard Nav II or III.
You may want to go to your local BMW dealer and get the square nuts and bolts for mounting a Nav III to the factory prep'ed mount. The Zumo lines up with the provided mounting surface and works well there. It is not a difficult install.