The Screw,tapping is the lowest priced item on this Fresh Air Panel schematic.
Parts such as the Fresh Air Panel: Cushion, Fresh Air Guide, Seal, R. Fresh Air Panel, Seal, L. Fresh Air Duct, Seal, L. Fresh Air Panel are included in the Civic Sdn/wgn 1978 3dr1500 (kh,kl,ka) Fresh Air Panel parts fiche.
This Duct, R. Fresh Air is the most expensive of the items that make up this Fresh Air Panel assembly.