Hi Dick,
I heard your Oi shout from Brighton ...
I had explained some month backs, RAM-MAG-1 but can I find the thread reply
The RAM-MAG-1 screen GPS Magnifier is sized 50mm x 100mm with 2x magnification.
It comes with a diamond adaptor, so it works with all RAM cradles and a ratcheting feature with rigi-flex rod. Look at this page link as it has an expoloded side on view as well as a view showing the magnification effect to the user.
http://www.ram-mount-uk.com/ram-mag-1.htm
Its most unlikely to attach onto the garmin auto mount. But if you have the bike mount kit then to overcome this use a RAP-224-1 with a RAM-B-238 then transfer arm upwards from the bike into the car.
RAM-man