Where is the kernel source on FC2 test2

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Hello,
I installed FC2 test2 with the kernel source selcted.
Now I want to install a piece of hardware but I need the source for that.
where is it? I can't find it.
(when I say /usr/src/linux it says : "Header files are there but incomplete or missing source")
(I'm installing my Sitecom WL-012 with the newest prism2x USB drivers, linux-wlan-ng-0.2.1-pre20 )
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