On this parts fiche the Bolt (j40) is the most specified component.
twenty-six components are shown in this 9.9d/15d 1990/1991 Lower - Drive 2 exploded diagram.
Some items from this specific schematic: Propeller Assy (3x9-1/4"x8"-j), Washer, Plate(6g9), Bolt (682), Prop Assy(3x9-1/4"x9-3/4"-j).