The MC21 (and MC18) use the same pitch (blind) calipers as the VFR, but smaller disks. The VFR uses 296mm and the NSR uses 276mm.
The brackets will work, but you would probably be better off fitting MC28 forks that use the threaded calipers rather than using brackets - it would look cleaner for a start.
Alternatively you can use VFR forks, and then you will have a setup you are more familiar with. The whole lot will slip striaght in; forks, wheel, axle, spacers, calipers and disks.
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Andy.
NSR-WORLD.COM
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