70 Duster 2 speed wiper switch with washer

I have smaller two speed switches with push to wash. Some even say wash on the knob that does not fit the large three speed switch. They have a different size shaft. I'll have to get them out and dig into this after I get done with my work today. I may be wrong but I know I have the same smaller switches with the wash knob. I believe the take a brown single wire on an extra prong. ???? Could they have made a dealer installed electric wash. It would only have taken a switch one wire and the bottle.