Hi,
Below is the link to the Sat Nav mounting disc. The diameter is 3" so should be OK with your Garmin. Having now checked the cost they are £2, unless you buy it with a Sat Nav then they are half price.
http://www.halfords.com/technology/sat-nav/sat-nav-accessories/halfords-sat-nav-mounting-disc,
The sticky tape on the back has so far stuck very well to the plastic panel. Even when I had to re-locate the plate backwards slightly (to avoid inadvertant screen touches), it took some prising off, but has subsequently stuck back on with the same enthusiasm!
I don't have a photo of it at the moment and the car is with Williams at the moment have a few minor snags resolved. When I get it back I'll then post one.
The location is perfect in my opinion and although it's in a shaded area the satellite signal is still strong.
