Update to an arbitrary version

Hi Yum List,

I'm running my own repository containing a bunch of custom RPMs for 
proprietary software. The repository contains MANY versions of each 
piece of software.

I am able to install a arbitrary version of the software using the 
syntax 'yum install rpmname-ver'. I would like to update a rpm to a 
version that is higher than the installed rpm version but not the 
highest. I can't seem to figure out how to do this.

Yum update does update to the highest version but, why can't I get at 
these intermediate versions?

For example:
*yum search qmesh-media-info *

qmesh-media-info.x86_64                  2.0.2.8-16819          
qmesh          
Matched from:
qmesh-media-info

qmesh-media-info.x86_64                  2.0.2.1-15986          
qmesh          
Matched from:
qmesh-media-info

qmesh-media-info.x86_64                  2.0.2.0-15767          
qmesh          
Matched from:
qmesh-media-info

*yum install qmesh-media-info-2.0.2.0*
*installs qmesh-media-info 2.0.2.0*

DOES NOT WORK:
*yum install qmesh-media-info-2.0.2.1
yum update qmesh-media-info-2.0.2.1*

*yum list available qmesh-media-info 2.0.2.1*
Lists nothing

Any ideas?

I really don't want to have to install the latest then downgrade using 
that allow-downgrade plugin =)

Thanks in advance,
Nolan