From the various pics - it looks like it mounts to the Garmin Zumo 660/Nav 5 cradle.
You can see that the cradle has the spring-loaded pins, and the new cradle has the fixed terminals.
So - you need at least, a Zumo 660 cradle on your bike.
A friend of mine tried to run his IPhone 6+ as a sat Nav on his bike in South of France, and found that the unit got very hot, and due to that and the screen having to be extra bright - the battery would not hold charge, even with a high-capacity USB feed. Something to think about.