You have to get a European '08 Honda. The American bike have radial brakes and will not fit.
http://www.ebay.co.uk/itm/HONDA-HORNET-0...id=354813365284

read about here:

http://www.triumphrat.net/twins-technical-talk/190917-three-piston-caliper-revisited.html

I looked up the parts on Bike Bandit and the part numbers are the same for our bikes and the Bonnie's..at least for my 2006 speedmaster.