One forum's post showed someone using a Kawasaki EX500 rotor. It has the same bolt spacing as the carrier on our bike. It's 282mm. I measured & came up with 298mm possibly fitting. Figured if I was going to do this, may as well get the most out of it. Picked up a late model Vmax front rotor, bolted it to the CB carrier & prayed it wouldn't interfere with the lower mounting point on the fork. It's tight but there is clearance.