Kernel Source code

[centos <centos@xxxxxxxxxxxxxx>]

Hello

I have downloaded  the Centos ISO and installed in on my computer and
uname -r shows  2.6.9-55.plus.c4

now I need exact version of source code to compile another application 
against it,
but I can not find  the exact source code.

where can I find this exact version of source code ?

Thanks

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