3 speed or three position, 1 being OFF? Don't know of a three speed switch on 57. Must NOT be deluxe because mounting of that needs no nut.
Is it like this?
http://www.classicparts.com/1955-59-Heater-Switch-Original-Standard/productinfo/68-321/#.Vl1O0-mFM5s
The GMC 2 speed switch is very similar. The standard fan switch was mounted on a heater delete plate. I think GMC had stenciling on the plate and on Chevy the knob was marked?
BTW: welcome back after 4 years?


Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn