I am recommending is that you downlaod and burn a new set of CDs. RedHat releases updated .ISO images which contain the installation AND all updates since the original install CDs came out. This includes newer kernels and additional hardware drivers. Odds are with an updated install CD things will "just work" and you won't have to figure out how to get/make a driver diskette.
To get the latest ISO CD images, log in to rhn.redhat.com, click on "Channels", click on "Red Hat Enterprise Linux AS (v. 2.1 for i386)", click on "Downloads" and download the three "Binary Disc #" images. Finally burn the ISO images to CD using your CD burning software of choice.
Armed with your new install CDs you will probably have the drivers you need for your newer hardware... plus you will end up with the majority of available patches already installed on your system before your first update.