What goes through these holes in the firewall?

When I first got my Dart, there was a non-AC type coil in front of the radiator, hoses with coolant type hose clamps and a non factory bracket on the engine. I figure at some point there was some kind of evaporative cooler on the car and this is where the hoses went in to the passenger compartment. There were also two holes in the transmission tunnel I assume for drainage???

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I assumed the holes in the OP were for aftermarket/dealer AC

Alan