The component with the lowest price in the OPTIONAL PARTS LEAD WIRE - ACCESSORIES schematic is the Screw,panh.tapping.
Parts such as the Optional Parts Lead Wire - Accessories: Screw,panh.tapping, Wire, Lead, Trim & Tilt Switch, Fuse (10a) are included in the P150trp 1991 Optional Parts Lead Wire - Accessories parts fiche.
With two applications this Screw,panh.tapping is the most specified part.