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If you just need 21/18 hoops that is relatively easy. Tusk or whatever.
The front rotor is kind of odd. 310mm. I think caliper brackets to go to a smaller rotor are rare.
FYI the rear hub is entirely interchangeable with KTM dirt offerings from the 2000’s and 2010’s. I was able to bolt a DRZ 400 rear right to my 2012 200 XC.