You might try Roy Nacewicz Parts, (313) 383-3673, fordbolts.comThanks for the replies. I like the idea of saving the bolt. Allen replacement bolts seem kind of out of place.
John
Before installing the new "RN" bolt why not just twist off the head and saw a slot for a screwdriver. Then install. Will make it easier for the next guy who has to remove it 100 years from now.