The 08 Busa stock caliper is like the 2007 Gixxer 1K. It uses a lug arm that goes into the swingarm to keep it from rotating. this is instead of the torque are they used to use.
I make a machined billet arm for the 1K Gixxer and will also make one for the 08 Busa(it is the same, just the Busa rotor is larger). IT uses the stock brake caliper and rotor, and goes into an extended swingarm slot to keep it from rotating. it is neat and clean.