[CentOS] kernel source kernel-devel-smp-2.6.9-42.0.3.EL RPM

Dear list,

for the purpose of installing a qlogic driver into my system, I need the 
exact kernel source version mentioned above. The kernel version is a 
dependency for the cluster suite (for centos4) package, which has been 
installed using yum (yum install cman gfs [...]).

Where can I get the kernel source for this exact version? The only one 
which is offered to me by yum is version 2.6.9-42.0.10, which I could 
re-link of course with /usr/src/linux-2.6, but isn't there a nicer way?

is asking thankfully
Sebastian