Check out any of the three Auto Radio components enlisted.
Parts such as the Auto Radio: Tuner Assy. *nh365l*, Bolt Flange 5x7, Knob, Volume are included in the Civic 2004 (4) 2dr Hx (ka) Auto Radio parts fiche.
The Bolt Flange 5x7 is the lowest priced item on this Auto Radio schematic.