I have an 03 GSXR 1000 swing arm on my 03 Busa. To say the least, it needed modding..... Have another one in the shop that just needs to be anodized. If your interested get in touch with me. GSXR 750/1000 swingarms are not a straight forward swap but once they're modded they take off about 1-1/4" in length. Very tuneable with the stock shock and will include 3 sets of machined dog bones that go from stock to a 7/8" lift. It took me 3yrs to put a package together that actually works. There are a lot of people out there that will tell you that this is plug and play, total bullshit. In 3yrs I've only seen one other bike that has accomplished this system, the Yoshimura X-1. You need to understand that you are totally changing the characteristic of the Busa in steering, weight balance and high speed ability. I think if this was an ez swap you would see more people doing it. What I have seen is 600 arms lengthened but think the lack of bracing isn't the smartest idea considering the Busa's power.