Someone was asking about a right hand mirror unit.. Cant remember who it was tho..
Anyway theres one on fleabay.
http://www.ebay.co.uk/itm/Kawasaki-GTR1400-R-H-Mirror-/150999907760?pt=UK_Motorcycle_Parts&hash=item23284bbdb0
Also a left hand one.
http://www.ebay.co.uk/itm/Kawasaki-GTR1400-L-H-Mirror-/150999906726?pt=UK_Motorcycle_Parts&hash=item23284bb9a6
The guy also has a few other GTR parts