I don't know if they fit , but I do know if I was going to put a k5 in any frame , it would be a 16 kx450 they handle much better than any kxf made before it , I had a 07 450 when they come out , sorry to be blunt I would not waste my time with it , at least use a late 250f frame and change the clamp offset to 22 mm that would be good.