Wiper Switches

I just went through getting parts to convert my 64 Valiant single speed wiper to variable speed. Just got the parts, today, so haven't tried to install yet. As far as I can see 64-65 Valiant/Dart were either single speed with or without washers, or variable speed with or without washers. That's all that shows in the parts book. No 2 or 3 speed. Haven't checked 1966, but would think that is the same.