The bracket for mounting on the handlebar is included. However, I mounted it with a base plate (4 holes/screws) in the middle of the handlebar. The base plate of the Zumo 550 / 595 fits. The cable for the connection is also supplied and the snap-on mount for the navigation system is also included. So if you had a navigation system mounted before, you will have no problems.

There are pictures on the garmin website
The xt has a new mount that does not fit on any other version