Mishimoto MMRAD-GMT-55X Chevrolet/GM&nbsp;3100 Series Truck X-Line Performance Aluminum Radiator, 1955&ndash;1959, Silver Fits 1955-1959 Chevy/GMC 3100 Series Truck Overall Size: 27 x 26.2 x 5.6 / Core Size: 21.7 x 19.4 / Rows: 3 Inlet & Outlet: 1.5, 1.75 / Core Thickness: 2 / Tank Wall Thickness: 0.08 Engine Codes: 235ci, 265ci, 283ci / DPI: 5559 Mishimoto Lifetime Warranty