This is the fan belt for the generator. Fits: 1937-1952 All, 1953-1955 Utility (1st series) (except 261ci). 42-1/2" O.D. X 11/16" wide Note: Also used on 1954 commer... For 1937 1938 1939 1940 1941 1942 1944 1945 1946 1947 1948 1949 1950 1951 1952 Chevrolet Cars and Trucks