The CCE designates a configuration point, while the STIG directs how that configuration point should be set, so the CCE and the STIG reference numbers serve different purposes. You may want to point this out to your folks, Carolyn. If a given CCE id needed to be set one way on one platform but another way on another, they'd have the same CCE but a different DISA GEN number.
In a version of a STIG that I found yesterday it had cross-references to the CCE numbers, let's see... Ah, here's something - the RHEL5 Benchmark 2.0 document contains a CCE reference for each item. Here's a copy on Scribd:
So yeah, to get a mapping from CCE to RHEL5 STIG numbers it looks like you'd need to sift it out of a document, unfortunately. The CCE reference list for RHEL5 from this page:
... cross-references section numbers of the NSA guide, but doesn't cross-reference the DISA STIG. You may want to poke the Mitre folks, though, to see if they're working on something so you don't duplicate effort.
-Michael Pelletier.