The twelve Kz305a1 Csr 1981 Usa Air Cleaner component parts are all listed in this schematic.
A sample from the products for the Air Cleaner include: Cap,air Filter, Washer,6.5x16x2, Duct,air Filter, Tube,breather.
The sub assemblies and components that make up this Air Cleaner include this Case-air Filter, the most expensive part.