Coolant Reservoir for 76 Plymouth Duster

I am missing the coolant reservoir for my 76 Duster and I’ve seen a ton of different coolant reservoirs and set ups on different cars. This is my first engine build, so I’m confused about what hooks up to the coolant reservoir. Does a hose just connect the radiator to the coolant reservoir? What does it connect to after that? I’ve seen some other boxes hooked up right next to a coolant reservoir, but I’m not sure what it is. If you have any pictures of the correct setup, it would be greatly appreciated. Thanks!

P.S. my car doesn’t have air conditioning. Idk if that changes much.