I dont think you need seperate drivers for your pen drive under RH9. You might just want to mount it.
Plug it, create directory to mount it for example
mount /dev/sda1 /mnt/usb
If things were successful you'll be able to browse the contents of your pen drive under /mnt/usb. These are the most typical settings. If they don't work you'll have to change a few things.
If you don't have a specific reason to use RH9, I'd suggest you to switch to a newer distro like Fedora Core 4. RH9 is old as you may know.
If you really need drivers try a Google Linux Search