I think what is widely understood is that G's were standard on GTO's, however there are anomalies. Dad bought his 69 goat new and it came with F's. Still has the original untouched F spare in the trunk. They were all whitewalls by the way.
Discussed this with people more knowledgeable than me and it's believed since the car was built at the Baltimore plant where they were also running Chevelles that used F's, it could have mistakenly gotten the F's. I'm sure that is not the norm so why a tire rep is recommending them is odd. He may just be lumping the GTO in with the rest of the A body stuff.
Either way doesn't matter, F's were on the car when he bought it new but if you're restoring one and the build sheet also calls out G's, I'd be putting G's on it.
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