In this schematic the "Bolt,flange 6x14" is used most often.
Parts such as the Water Pump - C.d.i. Pulser: Gasket,water Pump (nas), Washer Seal, 6mm, Washer,plain,5mm, Bolt,flange 6x14 are included in the Cx500 1978 Italy Water Pump - C.d.i. Pulser parts fiche.
This Pulser,cdi Hitach is the most expensive of the items that make up this Water Pump - C.d.i. Pulser assembly.