I used the stock R1 front axle on my bike. I have the 06 gsxr 1000 forks, I just machined the r1 axle down on the allen bolt side so it fits thru the opposite fork leg of the gsxr fork. And made a billet bushing to fill gap between other fork leg and axle. Would post pics but havent figured out how to, always get a file to large error.