Cut em, mcmastercarr, or try the caliper bolts off a 03-04 gsxr 1000. Those had 300mm rotors, so I’d assume the bolt is shorter. 05-06 gsxr 1000 had 310mm. Busa has 320mm. Different calipers and forks thru out the years so u would have to look up a parts fiche and see, like ronayers.