The Headlight is made up of components including this Unit Head Light R which is the most expensive.
The most reasonably priced component used on the Civic 2000 (y) 4dr Gx Abs (ka) Headlight is the Bolt Wash 6x16.
Some items from this specific schematic: Cover Rubber, Bulb,head Light, Unit Head Light R, Bolt Wash 6x16.