You can just put a small riser of max 30 mm below the bars. No need to replace them. Risers is available from cheap to very expensive. I've just bought some cheap ones off ebay. I just choose a seller with cheap postage to my part of the world :-)

The following is just an exampler: http://www.ebay.co.uk/itm/Handle-bar...item5d306e4211

Just search for "30mm riser 22mm"

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2011 Yamaha XT660Z ABS T�n�r�.

• Puig +8cm dark screen, Garmin Zumo 220, Scottoiler eSystem v2
• Barkbusters Storm with external weights, Noname 30mm bar risers & EzMoto alu. levers
• Kev's O2 Controller, Mccoi stepless controller with Hein Gericke heated grips
• TT +4cm seat, Pivot Pegs, Altech stainless sprocket cover