ok. a guy asked me for i'm selling a set of 1k rims. and as far as the 07 busa goes it shows one on the suzuki website. go check it out.
you can put the busa wheel on the gsxr but not the gsxr wheel on the busa, as the busa wheel is wider and the gsxr wheel wouldn't tighten up on the busa without some sort of spacers, that I have never hear of anyone making, that and the rotors are 10mm smaller, and have a different bolt pattern than the busa