Parts such as the Heater Blower: Screw Tapping 4x1, Screw Tapping 5x12, Resistor Blower, Motor Assy, With Fan are included in the Civic 1992 (n) 4dr Lx (ka,kl) Heater Blower parts fiche.
In this schematic the "Screw Tapping 5x16" is used most often.
The Heater Blower assembly is constructed from several parts from which the Blower Sub Assy is the most expensive.