The Nut,flange,6mm is the most widely applied product in the CIVIC WAGON 1990 (L) WGN 4WD 1600 (KA,KL) CYLINDER BLOCK-OIL PAN ( ten times ).
Some items from this specific schematic: Oil Seal, 80x100x10, Cover,r Side, Washer,plug Drain, Nut,flange,6mm.
The Cylinder Block-oil Pan assembly is constructed from several parts from which the Block Assy.,cylin is the most expensive.