The Heater Lever assembly is constructed from several parts from which the Switch,heater is the most expensive.
Parts such as the Heater Lever: Cable Hot Contl, E Washer,4, Lever, Hot Air Control, Screw,pan,5x12 are included in the Civic 1978 2dr1200 (ka) Heater Lever parts fiche.
The lowest price component in this Heater Lever parts-list fiche is the Screw,cross 3x6.
