There is no /lib/modules/<version>/st.o in the shipping rpms for kernel 2.2.5, nor is it in recent update release. I have checked kernel rpms for i386, i586, and i686 on my shipping CD, and downloaded the most recent i585 rpm from you Web site to see if it's in there. Can't find it. Is this no longer precompiled?
it's compiled into the kernel. this might change back in a future release.