W/Wiper & Headlight Switch Knobs

Good information, I didn't know that. I wonder if 2 and 3 speed wipers switches use a different knob. Mine is a 2 speed. I guess I could mic the hole in mine. I'll see what I can come up with. I would think at minimum that 67-69 Darts would be the same or at least close. I'll post the hole size just as soon as I get back from the shop.
Thanks,
Martin

Yup, 2 speed and 3 speed are different and there's a difference between washer and non-washer...and there are differences between the years even though the face is the same. I think there are about six variations all together.