Comment 23 for bug 1034961

$ sudo yum install openssl10 --enablerepo=ius-testing
Loaded plugins: downloadonly, fastestmirror, priorities, replace, security
Loading mirror speeds from cached hostfile
 * base: centos.mirror.constant.com
 * epel: mirror.us.leaseweb.net
 * extras: centos.mirror.constant.com
 * ius: archive.linux.duke.edu
 * ius-testing: archive.linux.duke.edu
 * rpmforge: mirror.us.leaseweb.net
 * rpmforge-extras: mirror.us.leaseweb.net
 * updates: centos.mirror.constant.com
2103 packages excluded due to repository priority protections
Setting up Install Process
Package matching openssl10-1.0.1c-9.ius.el6.i686 already installed. Checking for update.
Nothing to do

I think that worked since I see -9.