1955-57 Chevy Direct Fit Aluminum Radiator - Direct Replacement Mounting brackets that position it in back of the core support bar. Aluminum 2-row furnace brazed core with 1" tubes. Machined billet filler water neck with overflow fitting. Drain petcock and mounting clips. A built-in automatic transmission cooler lines that use 5/16" inverted flare tube O.E. fittings. (1/2"-20 flare cone)