Some items from this specific schematic: Nut, Washer(6.5x20x1.6), Socket Assy, Bulb(12v60/55w,h4).
The Headlamp (e2, E24) is made up of components including this Headlamp Assembly which is the most expensive.
The most reasonably priced component used on the Tl1000s 1997 (v) (e02 E04 E18 E22 E24 E25 E34 E39) / P37 Headlamp (e2, E24) is the Bulb(12v5w).