1965 Coupe. Heater Box Question.

Quick question guys. I've gutted the inside of my 65 and pulled the heater box. The box was damaged and needed a new core anyways. I think I may have ordered the wrong replacement heater box as I purchased one for a two speed motor. My old heater box has the red resistor installed, but the blower motor has only 2 wires, hence me thinking it was only a 2 speed. Any suggestions?

I bought from CJ Pony parts and it's on the way right now. Which box do I need to use?

Thanks guys. -Jh

Never mind. Is 3 spd.