D2SE-AA Applications: 1. 1972 and 1973 Cougar with H code 351-2V engines and air conditioning. 2. 1972 and 1973 Cougar with Q code 351-4V or 351CJ engines with or without air conditioning. Fan description - 5 blades and 18-1/2 inches in diameter. Ford master part number D2SZ-8600-A.Interesting Ford recall article for your reading enjoyment.
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!