Stud, holds exhaust pipe off motor, short, Norton singles

Exhaust pipe attachment bolt, Norton singles 1939 to 1949? Fitted on the rear on military side valves from 1937 to 1945.  7/16 inch x 20tpi approx 5-1/4 inch long.
Original part number:
3756 - exhaust pipe attachment bolt (front) 7/16in x 20ths