Heater Motor blower resistor

I've checked the coils and they look alright. The problem (best I remember) is that when I flip the fan switch on it wasn't coming on at all. At one time, it was working on one speed. In years past on my other duster, the resistor was the culprit. I figured that I'd just purchase a spare but I seem to be having a problem tracking down where to get one. I don't think it's my heater blower itself, or a fuse.
Thanks.
Greg........mtn_jake