'07 SCTA rulebook, P. 100, first thing on the page:
7.B.17 Steering damper: Required in all classes.
It's in the general motorcycle requirements, near the front of the bike section. No equivocating -- required.
By the way, since the comma cop hasn't been heard from recently -- there is no letter "n" in the word damper. It's NOT dampener, it's not dampner, it IS damper. Just thought I'd mention this. . .