With items like this being dusted off by GM, 40 to 50 years after the cars were produced, it makes me wonder what else GM has tucked away in their archives: shipping docs, more pertinent info for what cars got certain options. I can imagine a lot of documentation still being tucked away, that may be released slowly and periodically by GM at their discretion I suppose, or maybe as they run across it and come to the idea that there is a huge group of car owners waiting with baited breath for more docs to get released.