The ball is the same size so it fits the ibolt socket perfectly. The arm is a bit shorter, so it holds the device closer to the windshield. I also use it for a handicap card that is for small mirror which mine is not.

Garmin keeps popping off. Maybe that's 7 centimeters, it certainly isn't 7 inches. I've had several of those all prove they can't hold any of the bigger gpses that they came with.