The lowest price component in this Seat parts-list fiche is the Screw,6x14.
Parts such as the Seat: Hook,seat, Spring,sprkt Lev,ger, Damper, Screw,6x14 are included in the Zr550b3 Zephyr 1992 Europe Uk Fg Fr Gr Sp Seat parts fiche.
In this schematic the "Bolt" is used most often.