The Nut,hex.,6mm is the lowest priced item on this Alternator (denso) schematic.
The Alternator (denso) is made up of components including this Alternator Assy.( which is the most expensive.
Some items from this specific schematic: Nut,hex.,6mm, Insulation,bush, Screw,w/washer, Nut Hex, 5mm.