Some items from this specific schematic: Seal B(side Def), Screw,tapping,(po)4x, Non Woven Fabric, Duct,rear Heater.
The component with the lowest price in the DUCT schematic is the Screw,tapping,(po)4x.
eight components are listed in the schematic for this Civic 2003 (3) 4dr Dx (ka) Duct .