Ook, so my buddy wrecked his 04 zx10r, doing dumb stuff I am assuming. He bought all new parts, except for one he can't find. He said they call it a pulsing rotor or timing rotor, located down by the rear brake lever. I have not had to deal with this before, so I don't know about it. However, the problem lies in nobody having this part. Everyone says its on backorder indeffinitely. Any suggestions? Thanks for any help.