no problem, you can get it from this address
this is the sources for the kernel that came with RH9, so if you are using a different one, you will need to find its sources. If you are not sure if you are running a different kernel, you probably arent, but just to make sure, run the command
(you may need to be root to run it), and if the output is soemthing like
youre good to go. If it says pcmcia anywhere though, download this package instead.
when you get the package you need, simply go to where you downloaded it and run (you may need to be root to run this)
rpm -ivh kernel-2.4.20-8.src.rpm
change the package name if you have the pcmcia package
it is sometimes included, if you choose so, but it may not be. The usual place it is installed is /usr/src