Fact check, factory 9 1/4 rear?

Thanks guys, that's what I thought. Its a couple of guys in a fb group I'm in. Not trying to argue with them or prove them wrong, I just like to always increase my knowledge and figured since they're insisting that maybe it was something I was unaware of. I'm pretty sure they are mistaking their 8 1/4 axles for the 9 1/4. While I'm working on my knowledge, can you tell me if the /6 cars still used the 7 1/4 axles right up to the end of A body production in 76 or did the later A bodies all get the 8 1/4?