The most reasonably priced component used on the Civic 1998 (w) 4dr Ex (ka) Valve-rocker Arm (vtec) is the Nut, Tappet Adjg..
This schematic depicts all components used in the Civic 1998 (w) 4dr Ex (ka) Valve-rocker Arm (vtec) partslist.
With thirty-two applications this Cotter, Valve is the most specified part.