Hi, I have just fitted these to my wr125. Had to trim a little for the cables but other than that fits great. You will also need to buy the mounting kit to go into the bars and a 14mm drill bit to drill the bars out. Sounds harder than it is but mine went on a treat..
http://cgi.ebay.co.uk/Polisport-Sharp-Bark-Buster-Left-Hand-Side-Yamaha-Blue-/320663156521?pt=UK_Motorcycle_Parts&hash=item4aa9037729#ht_500wt_949
Hope this helps...