Wiper switch compatability?

That's what I initially thought since the knob does plunge a bit, but I don't think it's a button. There's no unused connectors on the back of the switch. From all the research I've been doing, it seems the button for the washers is only on variable speed, 2 or 3 speed wiper switches.

I did find a single speed Mopar switch used for a 1965 Dodge Polara and Monaco, but the shaft is very long. I was thinking about taking a chance on one and see if I could mount it since mine is already using a washer. It would just hang further back than my original. Wouldn't be able to tell from the front, but the back side would be comical.