The Screw,tapping,4x16 is the lowest priced item on this Front Grille schematic.
In this schematic the "Screw Tapp 3x12" is used most often.
Parts such as the Front Grille: Mldg,fr Gr*nh578*, Push Nut 3mm, Screw,tapping,4x16, Base,fr Grille are included in the Civic 2004 (4) 2dr Hx (ka) Front Grille parts fiche.