Looked at the 2001 brochure. Appears from the mention of Omega, the profile view and the little pics that as far as fiberglass goes, the SX and S22 shared a mold.
I'm going down this track because my tower is misaligned, or the wrong model or something - big twist in the top.
So check out the picture from the brochure that Pete's posted as a background grpahic in the History page. In that friggin picture, the SX tower is twisted !!! Notice the forward tube on the port side is higher than the aft tube, but the opposite is true on the starboard side.
No esta bien.