'63 Valiant V200 wagon - location of heater blower resistor

Yeah, that "in the heater box" threw me - but the resistor was "on" the heater box, and the connectors are now mated. And the radio was already out to replace the defroster grates. Thanks to all for your suggestions and help.
Thanks for the update. Some posters never let us know how things turned out. Or express their appreciation for our advice.