Some items from this specific schematic: Bolt,flange,6x35, O-ring,13.8x2.5, Block Assy,cyln, O-ring,8.4x2.4.
twenty-eight components are shown in this Gl1500 Goldwing 1988 (j) Austria / Kph Cylinder Block exploded diagram.
On this parts fiche the Dowel,pin,12x20 is the most specified component.