Exhaust pipe attachment bolt (stud), long, NOS, 3/8 inch x approx 6-3/4 inch long for Norton singles 1937 to 1949 - rear; 1932 to 1936 - front; 1937-1945 in cluding 16H military rear. Measure the hole in your crankcase and frame.
Original part number:
9243; 10245 - exhaust pipe attachment bolt