In this schematic the "Washer(6.5x20x1.6)" is used most often.
Parts such as the Tail Lamp (model W/x): Bulb(12v5w), Nut, Lens, Nut are included in the Tl1000s 1998 (w) (e02 E04 E18 E22 E24 E25 E34) Tail Lamp (model W/x) parts fiche.
The lowest price component in this Tail Lamp (model W/x) parts-list fiche is the Gasket (nas).