'64-'66 Heater Blower Motor Resistor Source?

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Have a '64 C10 w/ deluxe heater. Trying to get my stock heater up and going. Found the control panel assembly. Found the blower motor. Trying to figure out any missing parts I don't have.

I have been looking to see how to hook the switch on the control panel up and it appears that there is supposed to be a blower motor resistor?

Does anybody know where I might be able to obtain one of these blower resistors? Does anybody know where it mounted in the truck originally? Most of the heater system was gutted so I am flying blind.

Thanks.