The sub assemblies and components that make up this Antenna-speaker include this Coil, Glass Antenna, the most expensive part.
Some items from this specific schematic: Screw,tapping,(po)4x, Coil, Glass Antenna, Clip, Band Harn, Nut,flange,5mm.
The most reasonably priced component used on the Civic 1999 (x) 4dr Ex (ka) Antenna-speaker is the Screw,tapping,4x12.