C7AE-D, Fan description - 5 blades and 18 inches in diameter. Ford master part number C7AE-8600-D. These 5 blade flex fans usually came on full sized Ford and Mercury cars starting in 1967. Can be used on any engine with the proper spacer with fan shroud with adequate fan opening.
Check out this interesting video where they test the efficiency of factory style and aftermarket fans. Spoiler alert: the clutch fans are the most efficient!
Check out this video