What a great mount!  Unlike many other vent solutions that use universal cradles, this is manufactured specifically for your TomTom Go 520 720 or 920.  This fits the groove on the back of the TomTom just like the one that came in the box.  That means no cradle is needed. There is even a feature to lift the GPS  slightly toward eye level and leaves your rear speaker exposed (as to why they put a speaker on the back of the GPS versus the front is a mystery to me completely).

We include a premium vent mount that swivels and pivots too!

This is the functional equivalent to TomTom part 9UUA.001.00.