best place i know for parts is nitrohouse.com they are located only a few miles away from mugen usa and stock nearly every possible part and what they dont have they can get from mugen (if they have it) quickly
i used a set for xxx-nt and it was a pain in the butt they werent the right size at all i had to cut the ball cups and even after doing that the rods were nearly too long
i saw somewhere that mugen is suppossed to have a set available i may get them because i am already at the neg camber limits of the xxxnt ones i got