A sample from the products for the Srs Unit include: Sensor Assy,side, Sensor Assy,front, Reel Assy,cable, Bolt 6x20. Torx Eart.
On this parts fiche the Bolt 6x20. Torx Eart is the most specified component.
The most reasonably priced component used on the Civic 2003 (3) 4dr Lx Side Srs (ka) Srs Unit is the Bolt 6x20. Torx Eart.