Looking for the way of old school

How did the dudes back in the bo/lo dart and barracuda ss days do the door windows?
I would like to also do what they did since I'm trying to do a somewhat period correct build but as a 70 dart pro stock.
I know they had snaps on old seatbelts
But what did they do inside with the rest of the guts ???
If anyone has a few pictures I'd greatly appreciate it
Thank you.
took it all out except for the tracks for the window to go up and down in ...