Jim, I believe the website you were looking for is 1962Oldsmobile.com It is still active. Here’s a link directly to the Fisher Body data plate decoder:
You may have to copy and paste this to your web browser. I’m not sure how to make it a hyperlink. The codes seem to be correct….the S-384 on Eric’s 4-speed car tag correlates with the3-digit “IBM code”, 384 for 4-speed synchromesh transmission.