[CentOS] rhel source to updates?

I noticed on the rhel errata page:

http://rhn.redhat.com/errata/RHEA-2008-0001.html

that they have made a configuration change to fontconfig for the 
liberation fonts.
I have the liberation fonts installed via rebuild of fedora 8 src.rpm - 
including a fontconfig file.
I'm guessing the update will come through CentOS at some point and I'm 
trying to make sure there isn't a file conflict with my rpm and the 
update that would prevent installation - but I can't seem to find the 
sources for rhel updates.

I'm kicking myself because I found them before, didn't bookmark them, 
but I can't seem to find them now.

http://ftp.redhat.com/pub/redhat/linux/updates/enterprise/

doesn't seem to have anything for rhel5

The files in my f8 liberation rebuilt that I'm worried about conflicting 
with the update are:

/etc/X11/fontpath.d/liberation-fonts
/etc/fonts/conf.d/59-liberation-fonts.conf

I'm a little bit amazed that they are including an update for a 
configuration for fonts they don't seem to package, not sure why they 
are doing it - that doesn't seem to be their style, but anyway, does 
anyone know who mirrors the rhel src.rpm updates for free software packages?