Quote: The head, switch, and lettering is the same for all.
I Disagree with that statement. I've found 3 variations, and would be happy if anyone could tell me what years/cars they go with. (or maybe they were just made by a different vendor?)
I stand corrected - forgot about the notch and "SET" lettering. When I was collecting these, it seemed the notch appeared somewhere around the mid-70 model year. I never found any with the "SET" lettering prior to 70. These dates could vary of course.
This one came off a 70 Satellite, May build date (I usually kept the fender tags for parts w/o date codes):
