The most reasonably priced component used on the Civic 2004 (4) 4dr Dx (ka) Front Grille is the Screw,tapping,4x16.
In this schematic the "Screw Tapp 3x12" is used most often.
Some items from this specific schematic: Push Nut 3mm, Mldg,fr G*nh623m*, Mldg,fr Gr*g511m*, Screw,tapping,4x16.