FFWood, it doesn't matter. From everything I can tell, the difference between the two is color. I asked the guy I bought mine from as he races in GNCC, and that is what he said. Mine were half an inch longer than stock, and I have the regular 450 shocks, DaGirl's got the X shocks and hers are the same length. Just do what EIN said about the preload, and you will be good. Of course you can tighten them down even more as well though like TRIZZ, but I think that makes it sit up way to high, plus not as much bounce.
2008 700xx; Power Bomb header with power core 4 exhaust, Power Programmer III, pro armor nerfs, prm products control front and rear bumpers and full skid, 10" ITP rears, ITP Baja's fronts, RZR 2's all the way around, Uni filter, 13t sprocket, CCP steering Damper, DS450 shock swap, Dual Gasser Throttle, bar risers and Moose barkBusters. 730XX kit plus other engine mods!