Parts such as the Oil Pump: Washer, Sealing, 14, Screw Flat 6x16, Bolt, Stud, 6x28, Dowel,pin,8x14 are included in the Civic Wagon 4wd 1987 (h) Wgn 4wd (ka,kl) Oil Pump parts fiche.
Of all the components that make up this Oil Pump the Screw Flat 6x16 has the lowest price.
In this schematic the "Screw Flat 6x16" is used most often.