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5. Flex-a-lite recommends the widest core you can fit in your OE radiator opening to maximize cooling efficiency. The widest core we could use was 22 inches; however the overall size becomes 27� inches with the Flex-a-fit tanks, putting us over our framerail measurements by just a hair. The solution—we had Flex-a-lite mill off the bottom 3 inches of the fins for clearance.