Hoo boy, some interesting questions.
My book says 2-1/8″ bore. I don’t know if that is meant to be exact or nominal. 2.11″ does sound strange.
The bevel on the rings—that bevel is on the inner diameter, right?
I don’t have the 1957 parts book but 1958 book says part number is 463-1877, and dates unchanged way back to 1946, so I doubt the 1957 would be any different.
Oops, wrong picture
