couple quick questions

[1974ChevyC10]

lately ive been accumulating the last bit of parts i need to get my truck in better shape-the last couple things i need are those clips that connect the cables to the heater core box under the dash-that open and close the windows/flaps when you choose a setting on the heater controls-what are they called and where you can you get them at-a auto parts store or a hardware store.also i need one of those clamps that bolt the heater hoses to the inner fender-can i get that at an auto parts store to or is a trip to the hardware store in order for that too.ive never bought these items before so im trying to get an idea where to get them at.my truck is a 1978 Chevy if that helps at all.