Anyone have a chart like Jeff's has above for Firestone tires?

I have searched for years, and wrote and called Firestone probably 10 years ago trying to get that. After several calls and getting passed around to a bunch of folks who had no idea (except to refer me to the current DOT dating system), I finally spoke to someone that was referred to (by the person who transferred me) as their "historian", who said they had no records relating to anything that old. And she did not have any interest in doing any digging to see if there might actually be something there that she was unaware of that would answer the question. So a dead end ...

Here's some 69 Firestone codes I ran across the other day...