Parts such as the Rear Combination Light ('78-'79): Light,r.back Up., Lens,l., Nut-wash.,6mm, Gask Ta/li Lens are included in the Civic 1978 2dr1200 (ka) Rear Combination Light ('78-'79) parts fiche.
On this parts fiche the Bulb (12v 32cp) is the most specified component.
The lowest price component in this Rear Combination Light ('78-'79) parts-list fiche is the Nut-wash.,6mm.