From another thread on same subject
https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1180335/2.html
Originally Posted by Grigg
Lug nuts,
From my research they are originally 3/4" over flats and 1/2-20 thread. Common grade 8 nuts are the right shape/size.
I purchased two boxes of "armor coat" nuts from McMaster Carr, their part number 93827A249
http://www.mcmaster.com/#93827a249/=14geajr

•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-