Seeking information on factory shoulder belts

[cjohnson6772]

I am completely clueless about shoulder belts. Only seen a couple set ups. Hoping for some good pics/info to get me started.

Starting questions:

From the factory was this set up used with a lap belt and then a separate shoulder belt needing two female buckles per passenger? Or was it somehow all one belt?

Did they make these shoulder belts for the 67 lift latch style belts?

I really know nothing.....so feel free to educate me please oh wise ones