Some items from this specific schematic: Cover,srs Unit R, Holder Conn 2p (cabe, Band Harn, Offset(20, Screw,tapping,(po)4x.
The lowest price component in this Srs Unit parts-list fiche is the Screw,tapping,(po)4x.
In this schematic the "Bolt 6x20. Torx Eart" is used most often.