Is there an archive of previous RPM versions from the updates repo?

[Robert Nichols]

Specifically, I'm looking for xscreensaver-base-5.11-9.fc12.respin1.i686 and
the corresponding xscreensaver-gl-base, xscreensaver-gl-extras, and
xscreensaver-gl-extras-gss RPMs.  The current 5.12-1 releases break a couple
of things on my system, and "yum downgrade" only offers to go all the way
back to the 5.10-2 release from the original F-12 distribution.