Duh. Totally forgot that you said you were doing this to get iSCSI boot working. Sorry ><
iSCSI booting is part of MBA unfortunately. MBA is responsible for choosing the boot method, loading the drivers and then hooking into the rest of the boot process to get it started.
So you got these cards from Dell but they're Cisco branded so therefore Dell won't do anything for you and neither will Cisco because you don't have a service contract? I also understand why your head is meeting the wall regularly over this.
I just checked Cisco.com with my guest level account and it still shows that I've got access to the UCS driver bundles/ISOs.