Connectors

Still can’t really find anything, any chance these are just connectors to options my car didn’t come with?
Yes.
So I am really bad at reading wiring diagrams, ...
OK.
I have the factory manual and was looking it over last night
Sounds like you're trying.
How 'bout we help you you get better at deciphering them?

'71 FSM provides a couple ways to tackle this; the wiring diagrams, and the cable diagrams for wiring 'adaptations'. My understanding is that 'Adaptations' are how they make the harness and connections fit or 'adapt' to the body.