i have both ktm and original @ hubs.
reason dont want use ktm wheels is i have rebuild it with new SS spokes and gold sm rim to mach my rear one.
have 3 axles, have axel same leght as ktm but thinner to suit @ hub. i am getting sleeve pressed onto the right side to makeit the same thickness as the ktm axles, and a nut for the left with a threadded internal section that acts as the end nut and sleeve for the left leg. these will also incorporate the spacers so i wont have try fiddle with spacers when fitting wheel.
i am not sure what do with speedo lugs on wheel, maybe grind them off