this is the little rubber piece that sits under the handle bar holder assembly. I have three new pieces in original packaging. How about $6 shipped for all three.
It is item #9 on this schematic..
http://fiche.ronayers.com/Index.cfm/Module/Main/TypeID/26/Type/Motorcycle/MakeID/2/Make/Suzuki/YearID/33/Year/1992/ModelID/6968/Model/GS500E/GroupID/299686/Group/HANDLEBAR_1989