[CentOS] Source for kernel.

Im brand new to CentOS, so this is probably a question with a simple
answer (if I only knew where to look).

Someone hans pointed me at the centos.plus kernel, which is close to
what I need, but I still have to add a couple of options.

So where do I find either the src for the centos.plus kernel, or a
diff from something like 2.8.18 or 2.6.28.8 ???

With this Ill be able to add my additional options...
-- 
                                        Reg.Clemens
                                        reg at dwf.com