Ok, I guess that makes sense then with the older board. However I went back and looks the SR 5.1 FP2 lien is from around 2006. I checked and see it supports the original RH 7.2 and RH 7.3 releases. So that is not anything having to do with the RH enterprise 7.x line out now.
This is even before they reverted back the numbering to AS 3.0, and 4.0, and now 5.x 6.x that is out there now.
So unless you got your hands on the older OS versions, this will no work for you.
Jeff