project king is right: the 67 bezels & glove box doors were Argent Silver and it is a matte/semi-gloss sheen - 68 and up were chrome.
if you are looking for a very very close match but in modern base/clear paint for the original GM "silver fawn poly", then 2003 Infinity/Nissan "Sunlit Sand" - code ev0 is as close as I have found (thanks theastronaut
).
the pics below show the Sunlit Sand. these were painted last week using Glasorit base/clear. We used Glasorit 522-322 Flexible Gloss Reducing Additive (matte paste) to achieve the 60% gloss (egg shell per the Glasorit mixing software) that GM originally called for. It goes on fairly glossy (pics were taken in spray booth), but the shine has died down to the correct "sheen" over the course of the last week as the base/clear cured.
hope this helps