Just to finish this off. I spoke to Red Hat, and they couldn't help me either. What they suggested was simply placing the newest version on disc, then booting off that, which will give me an upgrade option, and that will include all of the RPM's that I require. So, I will be going down that path. They did mention that I will lose no data in the process.
If anyone knows any differently, then please let me know.
Thanks for all your help.