I bought my ST5 used and it already had the SP Connect attached to the stem. so, i bought an SP Connect Phone Case for my iPhone 6s. it works great! i also bough a small sized, right angled (on both ends) USB lightning cable, so i can keep my phone powered up via the Stromer battery.
Note, I was going to try to get my Quad Lock to work on this bike but it was going to be too difficult with the way the bars are made, etc....
sorry, no photos, but best of luck.