1968 AA1 should be PPG 8588.

Over the years, I developed the opinion the AA1 leans towards green a little less than 1969/1970 A4.
The leaning is still there. Just different.

Disclaimer: Just an opinion and I'm no expert....Someone with a PPG mixing bank could confirm or deny any potential difference in the formulas....I am just trying to turn out good quality work/fairly closely match what I have and wouldn't debate that any more than I'd debate the word "buffed" in the description of one of them LOL.