These are the OG Leaf Springs off of a 1949 Chevy Chevrolet truck 3100. They have been professionally de arched/ flattened and retreated to original strength. They lower the truck about 8 inches. Just had them done but decided to go another route with the suspension. Comes with 3” axle upgrade kit for open drive line. Fits 1947-1954. The pictures are stock original, then de arched / flattened with them installed before and after. 1949, 49, 1950, 50, 1951, 51, 1952, 52, 1953, 52