The five Civic 2004 (4) 4dr Ex (ka) Srs Unit component parts are all listed in this schematic.
Some items from this specific schematic: Reel Assy,cable, Unit Assy,srs, Sensor Assy,front, Sensor Assy,front.
The component with the lowest price in the SRS UNIT schematic is the Bolt 6x20. Torx Eart.