I picked up one of these used from another forum member...
http://www.1cruiser.com/sa/p/Bakup(TM)_Driver_s_Backrest_for_Kawasaki_Concours_14_(2008)_-_Fully_Adjustable.htmStill getting used to it and messing with the adjustment, but that;s mostly because of the back brace I wear plus the jacket's back protector.