In this schematic the "Bolt,flange,6x25" is used most often.
Parts such as the Water Pump - Pulse Generator: Generator,pulse, Bolt,flange,6x80, Gaskt,pulser Cove (mca), Oil Seal 18x28x6 are included in the Cx500t Turbo 1982 (c) Netherlands Water Pump - Pulse Generator parts fiche.
Of all the components used in this assembly the Generator,pulse is the most expensive.