The Bolt Earth (4x12z is the cheapest item from this partsfiche.
The eighteen Civic 1990 (l) 4dr Ex (ka,kl) Interior Light-switch component parts are all listed in this schematic.
The Neo Wedge Bulb is the most widely applied product in the CIVIC 1990 (L) 4DR EX (KA,KL) INTERIOR LIGHT-SWITCH ( five times ).