Editing the Dell OMSA yum repo file on FC10, to allow updates from Dell Linux repos?

I am trying get the Dell yum repos working under Fedora Core 10, but am running into issues getting the OS recognized by the yum repo.  I have installed the Dell OMSA repository rpm, and that installs just fine.

I keep reading all these posts that say to modify the yum.conf file so that instead of saying "fc" it says "el5" but that doesn't seem to be applicable under FC10.  In FC10, all yum repos reside under /etc/yum.repos.d but in the dell-omsa-repository.repo repository definition file it doesn't specifically identify the OS.  Instead it refers to the system's variable for the OS:  

mirrorlist=http://linux.dell.com/repo/hardware/latest/mirrors.cgi?osname=el5&basearch=$basearch&dellsysidpluginver=$dellsysidpluginver

Is there a way to modify this line so that yum will think that it is trying to pull yum updates onto a RHEL5_x64 server, which from what I am reading should install all the rpms that are compatible with FC10_x64, which is what this server's OS actually is?