Crankcase engine plate attachment bolt (rear), assembly, Nortons, 1932 +. 2 bolts required per engine mount on early machines, Model 1, 16H, 18, 19,20, ES2. The rearward bolt requires 3423 to attach the primary case. 4 required on International 30 and 40, Also fits magdyno mount. 7/16inx20tpi Original part numbers. 3024; - crankcase engine plate bolt (with nuts complete) 7/16" E5375 - washer x 2 E3238; A3/103; 8907 - nut (7/16in)