Assembled AE Big Bore shocks tonight with the clear Kyosho X rings(Part number ORG03X), and they sucked air past the X rings as i bled them(before even putting on the caps). The X rings are too big in the center, and the shock shafts are slightly smaller than the V2 shafts. I do not recommend trying them as wasting your money, they felt smooth but did not seal against the shaft very well at all and would suck air past them with any side loading of the shaft. I put on the AE O rings and they bled perfectly, and i could not get them to pull air past the seals no matter how hard i tried. Also i've heard good things about the losi O rings, so i use either brand(losi and AE look identical). Hope this helps someone