It should be on there somewhere. if not, you can google for the .rpm for it.
Also found this on fedora's page
8.6. Following Generic Textbooks
Many of the tutorials, examples, and textbooks about Linux kernel development assume the kernel sources are installed under the /usr/src/linux/ directory. If you make a symbolic link, as shown below, you should be able to use those learning materials with the Fedora Core packages. Install the appropriate kernel sources, as shown earlier, and then run the following command:
su -c 'ln -s /usr/src/kernels/kernel-<all-the-rest> /usr/src/linux'
Enter the root password when prompted.
might be able to follow that.
Here's the page that came from.. http://fedora.redhat.com/docs/release-notes/fc5/
Lots of great info if you just want to build the headers or do the full source. You should check it out. Good reading.