Need help to ID a car part

[abe54]

I have two Ford trucks and know very little about cars especially 70's Fords. I have a 71 NOS mustang part I want to sell but need to know more about it first.

The part number is D1ZZ 6881 A. I know it is a oil cooler adapter but am not sure what size engine it is for. I would also like to know approximately what it is worth.

Thanks. Will post a pic of it soon.