Parts such as the Seat: Plug(4bp), Bolt, With Washer(3sh), Cover, Single Seat, Nut, Self-locking(jn5) are included in the Yzf750sp 1996 4hs8 Spain 264hs-300e1 Seat parts fiche.
In this schematic the "Damper, Seat" is used most often.
The lowest price component in this Seat parts-list fiche is the Bolt, With Washer(3sh).