Parts such as the Breather Tube: Clamp D 12.5 Tube, Washer,plug Drain 14, Tube,pcv, Valve Assy,pcv are included in the Civic 2005 (5) 3dr Si (ka) Breather Tube parts fiche.
In this schematic the "Clamp D 12.5 Tube" is used most often.
The Washer,plug Drain 14 is the cheapest item from this partsfiche.