1955-57 Chevy Direct Fit Aluminum Radiator - Direct Replacement 1955-57 Chevy direct fit replacement radiator features all aluminum construction and is designed to fit all 1955-UP Chevy passenger cars with a straight/inline 6 cylinder engine running a short or long style water pump. Mounting brackets that position to grille side of the core support bar. Aluminum 2-row furnace brazed core with 1" tubes. Machined billet filler water neck with overflow fitting. A built-in automatic transmission cooler lines that use 5/16" inverted flare tube O.E. fittings. (1/2"-20 flare cone)