which factory fan blade for 68 Barracuda with 383?

What is the correct fan blade for a 68 Barracuda 383 car? I found three part numbers in one of Galen's books. The fan part numbers are 2863213, 2863215, and 2863224. All of the fans have 7 blades and are 18" in diameter. Any help would be appreciated. If it makes any difference, the car was built in 1967.

Thanks,
Craig