I have installed SL4 on a few test systems.  I need to install Clearcase
before I can deploy to production systems.  Clearcase is only supported for
the initial RHEL4 kernel (not update 1).  Since I don't have RHEL4 itself I
don't know which one that was.

My SL4 system shows 2.6.9-5.0.5.ELsmp.

What kernel did RHEL4 initially release with?