imo, best wind deflectors is mugen, not original, because of price :) but it's replica, like this
http://www.ebay.co.uk/itm/220789709695?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 (think, i got this link half year ago from this forum)
i ordered them, arrived few days ago, very fast...