The eleven Civic 1997 (v) 4dr Dx (ka,kl) Heater Unit component parts are all listed in this schematic.
With six applications this Screw Tapping 5x12 is the most specified part.
A sample from the products for the Heater Unit include: Motor Assy Mode, Holder,rod, Screw Wash 4x16, Nut,flange,8mm.