C6OE-D and C7AE-F marked fans. Applications: 1. 1968 C code 289-2V engine without air conditioning or heavy duty, or 'extra cooling' option (small radiator). 2. 1969 Boss 302 Eliminator and Mustang.
Mustang owners, this 4 blade fan with the part number C6OE-D and (C7AE-F for 1967 and later), is also correct for those K code 289 HiPo engines in both 1966 and 1967. Fan description - 4 blades and 17-1/8 inches in diameter. Ford master part number C6OZ-8600-D.
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!