Some ideas...
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commented on "30mm Riser Lift Handle Bars"
http://www.storminbikes.co.nz/gallery/Handlebars/30mm-riser-lift-handle-bars/306207?view=jumbo
Riser Bars
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commented on "Clipons - Clip on Handlebars"
http://www.storminbikes.co.nz/gallery/Handlebars/clipons-clip-on-handlebars/147059?view=jumbo
Clipon Handlebars - Many diameters
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commented on "Riser Clipon Bars"
http://www.storminbikes.co.nz/gallery/Handlebars/riser-clipon-bars/147067?view=jumbo
Multi Adjustable High Bars