[CentOS] CentOS6.2: installation at specific kernel level

Hi, all

I have a number of machines that are out of sync with one another by virtue of having done a yum update after a base 6.2 install at different times (all were previous CentOS 5.3) Consequently, systems are a mix of 2.6.32-220.7.1, 2.6.32-220.13.1 or 2.6.32-220.17.1.

So 2 questions: - Is it possible to perform a yum update (or another other kind of update), specifying installation of, say, kernel 2.6.32-220.17.1 along with the packages that were relevant at the time when 2.6.32-220.17.1 was current? - Is it possible to capture and save for future installations the current kernel rev and associated packages as exist in the repos today and install as a "frozen-in-time" distribution?

thanks!

- c sawyer