AC Radiator Pressure Cap. Type: RC-4, Pressure: 4# 850798. Item fits the following:Autocar: Thru 1954 C-50, C-50TCadillac: 1937-1938 8-Cyl.Divco: 1940-1949 Sp. Eq; 1951-1953 UM8, ULM5, ULM6, ULM6B & ULM6DFord: 1949-1951 PartFord Tractor: 1947-1952 8N, 9NKaiser: 1946-1947; 1948Lincoln: 1942-1948 AllMassey Harris: PonyMercury: 1942-1948 AllNash: 1946-1949 Statesman, AmbassadorOldsmobile: 1941-1947 All; 1948 except 98Packard: 1939 1703-05; 1941 1900-01Pontiac: 1937-1948 AllReo: 1945-1949; 19, 20Studebaker: 1941-1953 All (pressure caps)Contact seller for more information if needed: 520-275-4623. Tucson Packard quality parts through the years, 40 years experience working with all makes and models of Packard auto and other auto parts. (21010)