Look in "Product dimensions" not "Shaft & Bushing Dimensions". It is previous page. But I must say I was also confused at the first look
Edit: in "Shaft & Bushing Dimensions" are pins clearly horizontal in "vertical" column
Ah, now I get it. One style they are saying has a vertical bush yet horizontal pins, the other has a horizontal bush yet vertical pins.
So there is no overall definition that a part is "Vertical" or "Horizontal" then, it depends what bits you are referring too.
That's just f**king great.
Thanks for clearing that up!