Polyurethane version of the lower radiator bushing, as used in one-piece metal radiator housings. The one piece radiator housing started in 1974 and originally used the same lower mounting points as earlier Minis. Then it was improved at the lower mounting point to include larger bushings on a single horizontal lower mounting bolt. This is the part you need if your radiator housing has the single horizontal lower bolt. Sold each, two (2) required. Ref: CAM4618P, CAM4618POLY.