got them at Tricounty. They are the Acerbis ones but you need an additional fixing kit as the SD has fatter bars. They are a f###ing pain to fit. need to retain the standard bar-ends which is a shame as they have a counter weight which goes inside the bar. between them probably weighs over 1lb. Also need to get the dremmel out and grind away part of the inside as the levers touch by the pivot/master cylinder.
Had some Acerbis hand guards on my drz supermoto... had to have the larger fitting kit as it had answer fat bars on it....they look very similar in diameter to the renthals on the superduke,if i recall the hand guards and fitting kit together were £50..... any mx shop should be able to supply some that would fit the sd i would think.