The lowest price component in this Alternator (mitsubishi) parts-list fiche is the Washer.
The Alternator (mitsubishi) assembly is constructed from several parts from which the Rectifier Assy. is the most expensive.
The twenty-five Civic 1989 (k) 4dr Lx (ka,kl) Alternator (mitsubishi) component parts are all listed in this schematic.