OPL Aluminum Performance Radiator for 1955-1957 Chevrolet Bel-Air 3.9L (Automatic Transmission) Direct fit for 1955-1957 Chevrolet Bel-Air 3.9L (Automatic Transmission only) Inlet: 1.5" / Outlet: 1.75" / Rows: 2 Core Size: 21.5" x 17.25" x 1.5" / Overall Size: 23.5" x 23.25" x 4.75" 10 year manufacturer warranty