Where do I find these....

[Chevelle454]

I am trying to get my tail lights wired up so I can finally drive my truck today for the first time, but I have a problem. I have the wires from the tail lights going all the way up to the cab, but I don't remember where they plug into the cab. I can't find a connector like the one coming from the tail lights anywhere. It was four years ago that I took it apart and took pictures of everything but that pretty much...

Any description of where it plugs in or pictures would be helpful. It's a 1972 C20 350 auto.

Thanks