I was wondering if the springs are any different for different displacements. I know there is a difference between 2 and 4 strokes because of the revs and all. I was wondering if going with a 450 rekluse set up would be better then going with the one for a 426. Then there is the issue of different years for the 450 as well. Talking about just the internals (hub, fibers, and plates) They are pretty much interchangeable, aren't they? I am currently running a hinson basket, gytr plates and fibers for a 2006, gytr hub and pressure plate for an 05.