This AIR CLEANER / BATTERY assembly utilises five Nut Hex 6mm(s) - the highest specified component.
The most reasonably priced component used on the Xl125 1978 Usa Air Cleaner / Battery is the Washer,plain, 6mm.
Some items from this specific schematic: Batt,assy 6n4c-1b, Packing,case, Collar,fr.fender, Tube,vinyl.