Use the Mandrake kernel-source. It does include things you wont find in the kernel.org kernel (supermount being one of them). I couldn't enumerate all the addons that Mandrake provides but it is worth it to use the official mandrake kernel-source rpms.
Probably the kernel-source is the best way, but someone in this list said not too much time ago there is a cumulative patch available somewhere that, applied to the standard kernel, makes it an MDK kernel.
I haven't found it but you could be more lucky (if interested).
Olaf
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