The lowest price component in this Turn Signals parts-list fiche is the Washer,plain,4mm.
The Zx750a3 Gpz750 1985 Usa California Canada Turn Signals consists of twelve pieces with the Lamp-assy-signal being the most expensive.
Some items from this specific schematic: Bulb.12v 23/8w, Bulb 12v 32cp, Washer,plain,4mm, Lens-signal Lamp,7460.