Back to the original question.
Seems to me someone could have measured the part with a micrometer or a pair of dial calipers and given you a prompt and correct answer.
Would have taken less time than the bad answers you got.

Try and ask if they can do that, assuming you have yet to get a real answer...

•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-