? about stock fan.

Ok I just started to install my new turbo and IC. When I removed my stock fan, I noticed that the resister was broken. Does any one know what size the resister is? Were can I get a new one? The fan works still. so what is it for?
The fan motor is actually single speed. The resister is used to make "low" speed (non AC, non high temp). The "low" speed relay is hooked up to the resistor, the "high" speed relay bypasses the resistor.
I don't know the size, but I see them all over the junk yard on other GM cars.