HI dforrest:
According to PapauZ's post here from 2011, Norton UAC was discontinued in 2009 and never progressed beyond beta testing. The last download link I could find in the forum for NUAC was here by Symantec employee Qi, and that link no longer works.
The Softpedia mirror site still has an old installer here for Norton UAC Tool 2008.1.0.11 (Beta). Softpedia has a good reputation (seee gizmo's review here) but as a precaution I would download the installer to your computer and then submit it for analysis to VirusTotal before you run it just to make sure it isn't bundled with malware. A high detection rate with VirusTotal would indicate that a wide variety of AV software considers the installer to be potentially unsafe/malicious.
There is also an old LifeHacker review here for other users that aren't familiar with this tool.