Find the model light and many times you can find them NOS if you search.
I’ve found several sets of new but old KD 517 lights for my trucks, they look the nicest in my opinion, and have glass lenses.


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-