Both the part #'s I have listed are for the 420a motor. I am honestly leaning toward the ACT simply because the 920.00~ includes the flywheel and I have heard a lot of good things from friends who own those clutches, just wanted to see if anyone had any good expesiences with either, or prefer one over the other. Ya, that FX600 is a tad out of my category, I don't need something that big, lol.