The component with the lowest price in the TURN SIGNAL schematic is the Screw,tap.,4x12.
On this parts fiche the Screw,tap.,4x12 is the most specified component.
Parts such as the Turn Signal: Winker Assy,r Fr, Screw,tap.,4x12, Bulb,tail Light, Winker Assy,l Fr are included in the St1300a 2006 (6) Usa Turn Signal parts fiche.