The component with the lowest price in the SIDE COVERS ('81 A7) schematic is the Screw,6x14.
Some items from this specific schematic: Cover-side,lh,f.black, Screw,6x14, Cover-side,rh,f.black.
This schematic depicts all components used in the Kx125-a6 Kx125 1980 United Kingdom Usa Canada Al Side Covers ('81 A7) partslist.