Dorman use to have an illustrated wheel stud catalog that listed the studs by the diameter, length and the spline diameter. I used that catalog to find the correct studs for mounting Buick drums on Ford hubs. The catalog doesn't seem to exist on the Dorman site?
I'm pretty sure I have one of those catalogs out in the garage. I use to bring home all the old catalogs from work when they sent out the new ones each year.
If your going to Buick drums, why not just use later 40’s hubs? Seems it would be easier, unless your keeping wide five wheels. And in that case, I’d like to see details on how you are accomplishing this.
I looked the the Dorman 'on-line' catalog and contacted their tech, they advised me to go to Moroso or ARP.
I am doing what you did, mating the Buick drum to Wide 5 hub, I tried using (I just doublechecked and realized I read my caliper wrong, my mistake) .563 knurl (I thought it was .663, dammit) and it is too small for the 2pc Ford hub/drum. Ford does show a .620 knurl but that is a huge difference.
The problem I found with the Dorman stud was the knurl didn't extend the full length of the shoulder, it stopped before going into the Ford hub.