Parts such as the Lower - Drive 2: Prop Assy (3x8-1/2"x8-1/2"-n), Nut, Propeller, Tube, Water, Propeller Assy (5") are included in the 6g/8g 1988 Lower - Drive 2 parts fiche.
Check out any of the twenty-two Lower - Drive 2 components enlisted.
The most reasonably priced component used on the 6g/8g 1988 Lower - Drive 2 is the Bolt (6g1).