although not the actual one in the link here
http://www.ebay.co.uk/itm/Motorcycle-13-15mm-Fork-Yoke-Stem-Mount-Large-Waterproof-Sat-Nav-GPS-Case-/161224451375?pt=UK_CE_GPS_Accessories_Software_ET&hash=item2589b9e52f
I fitted a ram head stock mount on my S1K back in 2012 to go to the TT, great...