Yeah that’s the ‘74 catalog. It’s literally the same page, I broke it up so it would be legible but those illustrations are right on top of each other. I’d say it was a carryover from the ‘73 catalog and then they changed the slider illustration but the text is different from ‘73 on both illustrations. So B bodies are a bit of a question mark. They definitely switched to sliders at some point in there but my B body is a ‘71 and I don’t know much about the 73+ B’s.
The E bodies didn’t change all the suspension stuff like the B’s did though in ‘73, everything basically stayed the same for the E’s except the spindles for ‘73. And the bumpers but that’s not really relevant.