Stud, holds exhaust pipe off motor, short, Norton singles, assy, to 1945?

Exhaust pipe attachment bolt, nut and washer assembly, for Norton singles 1937 to 1945? Fitted on the rear on military side valves from 1937 to 1945.  7/16 inch x 20tpi approx 5-1/4 inch long. Picture shows only the  stud / bolt.
Original part number:
3756 - exhaust pipe attachment bolt (front) 7/16in x 20ths