Crankcase engine plate attachment bolt and nut (rear), assembly, Nortons, 1945+. 2 required per engine mount, Model 1, 16H, 18, 19,20, ES2. 2 required post 1945, 4 required on International 30 and 40, Also fits magdyno mount. 7/16inx26tpi. Shorter bolt 3024 on pre 1946 machines. 1946 saw the 3024 replaced by the longer E4256 Original part numbers. 9038; E4256 - crankcase engine plate bolt (with nuts complete) longer 7/16" ; magneto platform bolt E5375 - washer x 2 E3238; A3/103; 8907 - nut (7/16in)