The lowest price component in this Carburetor (2) parts-list fiche is the Screw, Pan, 3x12.
A sample from the products for the Carburetor (2) include: Tube,overflow, Screw, Pan, 3x12, Chamber Set,float, Carburetor Assy..
In this schematic the "Screw, Pan, 3x12" is used most often.