1964-1981 Correct 5/8" Ribbed Heater Hose

For years all kinds of ribbed heater hose have been sold as correct for 1963-1977 Pontiacs. Reserch on original low mileage cars finds ours to be the onlly correct pattern with five depressed ribs between flats and peaks. A fine detailing must-have item for serious restorers.