The 951 rotors and calipers can fit onto the CB spindles, but it requires quite a bit of machining to the spindle. It's not easy, requires machining the spindle, fabricating a caliper bracket that bolts to the spindle, then the caliper bolts to the bracket. See pics at:
http://www.vdubcustoms.com/Wedo/pbrakes.htm
About 2/3rds of the way down the page look out for kits vdc-010-024/vdc-010-034.
As for shimming the pads to fit the NA rotor.....don't do it.
Lanner