Originally Posted by jdrocks
spacer is nominal 1/4", 6.3mm steel. layout, then drill and tap as necessary for full pad contact on the rotor. spacer mounting bolts may need to be clearanced to avoid interference with the rotor.
I did manage to find a used swingarm bolt from a ER6 to use as the front wheel axle.
The build will continue in a few weeks when it gets to cold to ride.