Kaiser-Frazer offered vent shades in six different sets. Because your set comes with four shades that eliminates the Kaiser business coupes and Henry J's so yours might fit the '47-'50 K-F sedans or the '51-'55 coupes, two or four door sedans. Vent shades were also made for most other popular makes of cars. Kaiser's part numbers probably won't match the numbers stamped under the vent shades. Vent shades did not appear in the K-F accessory price lists until the Nov. 15, 1950 issue but were introduced with Parts and Accessory Bulletin 114 dated Oct. 26, 1949. Technically they were not available on Kaiser-Frazer cars until late 1949. Maybe someone here has an old price list from the manufacturer.