Fedora Core - 1 : which RPM is kernel source?

[lin q]

Hi,
  I am trying to download the kernel source file from Fedora Core web
site, but from the name of the file, there are several candidates:

kernel-2.4.22-1.2115.nptl.src.rpm   32M
kernel-pcmcia-cs-3.1.31-13.src.rpm  1.2M
kernel-utils-2.4-9.1.101.fedora.src.rpm  571K

It seems the 1st one is the kernel, but do you know what are the else
for?

Thanks.

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