What SNMP MIB/OIDs for CPU & Memory?

When you are monitoring the built-in CPU/Memory from "List Resources" of a device, what MIB/OIDs are these a part of?  We recently updated a set of devices to snmpd 5.2.4 and since then, we cannot monitor CPU or Memory.  I need to report this condition to the vendor (Secure Computing) but they are having a problem understanding the issue.  I'd like to point them to the unique variables, if possible.

Thanks in advance.