Best looking at getting hold of these too, as you might not know what damage can be done by modifying an airbox without a safe enclosure... when in doubt, "Ask Kev" I am not a mechanic

http://cgi.ebay.co.uk/Yamaha-XT660-X...item3a53477cd8

http://cgi.ebay.co.uk/New-Prox-Pisto...item19b7fd61e9