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I did what LVPhotos said. I have a 62 Pontiac with factory A/C and no one makes a repo A/C heater core for my Catalina. The A/C & non A/C cars had the exact heater core dimensions, the heater hose outlets were different. bought the repo copper core and had the ends swapped off my old leaking core onto the new core by a local radiator shop. If I remember correctly he only charged me around $25.00.