There is a vendor on Ebay who is selling newly manufactured adjusting screws for Buick inline engines. They look very similar to stovebolt adjusters. I might buy one adjuster to do comparison measurements to a stovebolt item. Single adjusters are about $5.00 each, or he also has them in sets of 16. If they will interchange, it would probably be possible to make a deal for sets of 12.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!