1965 Plymouth Barracuda V8 Radiator

69FBCuda said

Two different widths, one for the /6 and one for the V8. Measure your opening.

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The opening in the core support is the same between the 6cyl and 8cyl. It's just the non-A/C 6 cylinders that have a 19" wide core. They just have a wider bracket on one side to take up the extra space.