The component with the lowest price in the UPPER CASING schematic is the Washer, Plain (646).
With a quantity of six pieces, the Bolt (682) is the most used part in the UPPER CASING diagram.
Some items from this specific schematic: Ybs67-8 Washer, Spring, Washer 1 6154367300, Casing, Upper, Washer, Plain (646).