Here is a picture of the back side of the fan. On the Taurus I pulled this out of it was mounted with 2 bolts, 1 on the top the other on the upper side. The 2 wings that stick out on the lower sides fit into an almost U channel that captured them.
The dimensions are...
-fan on the ground to the back of the motor is 4.75"
-Duct diameter is right about 14.5"
-Shroud Width 24"
-Shroud Tall 15"
-The shroud directly over the fan is about 16" tall
From what I can tell A TON of ford cars came with this fan, the shroud is a different size, shape and mounting configuration in a bunch of different cars and years. I would say go to the junk yard and start looking.