parts Manual shows two (2) different p/n's for the mounting studs - 6x 68-0018 (15/32" length) and 2x 68-0531 (3/8" length). the Manual doesn't give any real info on exact location, thus the question - where do the two shorter studs go? all eight (8) seem to go into blind holes.
thanks Allen - i do have 2 shouldered studs, located left front corner, and far right side. they correspond with larger holes in the cylinder barrel, HOWEVER, i have additional, front studs holes in the barrel that would accept shouldered studs. the shouldered studs are the longer 1-15/32" length. really need to know where the shorter 1- 3/8 stud go. don't know the history of the bike, and it's obvious somebody has had things apart. i don't have faith in anything right now.
go to fleabay , pull up bsa a65 cases . look at the pics . any and all years , shouldered-stud location is the same . you may not even notice the 2 wirh shoulders until you are aware to look for them ... and then there they are .