The component with the lowest price in the RADIATOR schematic is the Screw,tapping 3x8.
Parts such as the Radiator: Clamp,hose,22-29, Clamp,hose 27mm, Joint,tube, Sw.assy Thermo are included in the Nx250 1989 (k) Usa California Radiator parts fiche.
In this schematic the "Clamp,hose 27mm" is used most often.