The Nut,hex Cap 6mm is the cheapest item from this partsfiche.
Parts such as the Ignition Coil: Coil Comp,plug Ho, Coil Comp, Plug Hole, Nut,hex Cap 6mm, Spark Plug(pzfr6f-11 are included in the Civic 2004 (4) 4dr Lx (ka) Ignition Coil parts fiche.
The Civic 2004 (4) 4dr Lx (ka) Ignition Coil consists of five pieces with the Coil Comp, Plug Hole being the most expensive.