1967 Barracuda windshield wiper knob?

Greetings all!
I"m not sure if I have an original knob or not. It doesn't lock onto the switch shaft. I really dont want to glue it in place. I"ve searched extensively and it seems no one makes a repro knob. The closest I can find is a 1964 Barracuda knob that comes with a set screw on the knob. Does anyone if this will work. Thanks in advance!!!

Mike KlockView attachment 1715064758
silverfish looks great