The common use of this tire is E70X15 on 68- 69 Z-28 cars.
Beyond that I know nothing.
Pics are one of mine I am going to use as the spare in the 68 SS 396 El Camino I recently bought.
Probably not correct but I have it, it is period, in decent shape, the right size and there is no spare.
Going on a "XB" wheel.
The tire in post 1 is not the early version "POLYGLAS".
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