Parts such as the E-16: Bolt,hex.,6x10, Gear,m-3, Gear,c-3, Washer,thrust are included in the Nas250 1992 (n) Japan Mc26-100 E-16 parts fiche.
In this schematic the "Washer,a.spline" is used most often.
The Honda E-16 has twenty-two products enlisted in the schematic.