I just tried to find rear inner wheel studs using parts info from my Gillig Bus manual and the Parts Desk at Gillig Bus for our 1995 chassis.
That info led me to studs that were unlike the ones removed from my rig.
The tire dealer carried the broken stud to several truck parts houses locally and found a match in stock. I had him buy two extras studs and nuts for each side of the rig for my future use. Cost about $12 a set through the dealer. 1/2 that if I bought directly.
So, take the old stud to the parts store would be my advice.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs