The most reasonably priced component used on the Sh50 1987 (h) Austria E-1 Fan Cover-shroud is the Bolt,flange 6x20.
This schematic depicts all components used in the Sh50 1987 (h) Austria E-1 Fan Cover-shroud partslist.
On this parts fiche the Bolt,flange 6x20 is the most specified component.