The Parts Catalog shows 3 part numbers for the radiator cap. One was used S/N 501 to 115029, the other 2 S/N 115030 up. I presume that is the serial number break where the radiator was pressurized. The notch gives overflow pipe clearance, so was probably added with the cap change.
The 2 pressure caps are interchangeable. One is a D number and the other is an R number. I suppose one could have the wing and the other not, but that would be speculation (and counter to what rustyfarmall said). I don't know one way or the other on that question.
I see that CNKS posted while I was adding this comment. It really would be helpful for you to crack the parts book open yourself. You might find your own answer and including what you find there with your questions would help clarify your questions. It would save everyone who is trying to help you from repeating the leg work you can do for yourself. Might help people understand what your actual question is as well.
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