So who's wheels did you end up getting?
The 310mm rotor is a standard that beringer uses. The 4 and 6 piston ktm hardparts calipers you've seen dont need relocation brackes since the calipers are designed already spaced out fo the 310mm rotor.
In your case i dont think there are relocation brackets for 310mm. I'd suggest selling that rotor on supermoto junkie and buying a 320mm and relocation bracket
rotor: http://www.ktmcyclehutt.com/ktm-part...er=58309060000
bracket: http://www.ktmcyclehutt.com/ktm-part...er=77013914000
Mission cycle is giving smo members tax in pricing if you want the ktm parts. Other SMO sponsors may be able to help too