Ultimateaddons Mirror Stem Mount Attachment 8mm-16mm - 3 Prong Attachment

This product works well with the phone case. It should be said clearly that a phone mount is NOT included with the case. Good product.
I bought the mirror mount to use on a piece of half inch copper pipe which is my accessory bar. Hammer one end of copper pipe flat and mount under fairing on the mirror bolts. Paint it black. Note: my mirror stems are diamondy shaped, no good.
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I bought a TomTom Rider 550 which provides a RAM U-Bolt clamp wich I considered to be crude, poor quality and downright ugly.
In comparison, this mounting attachment - and also the Ultimateaddons Handlebar Mount Attachment - are both far superior. Recommended.
(The RAM mount went in the bin.)

Clamps firmly, works exactly as it should. Requires an allen key for installation/removal, which is prefered over the wider diameter ratchet version which could be easily removed by a passerby.

Clamps solidly to the wing mirror stem and holds the phone securely :-)