If you can convert one from blender, then just type in "blender 3d 20th century fox logo" into google. There are quite a few, also some of the youtube videos have links to various blender models of it.

Daz Studio 4.8 and 4.9beta, Blender 2.78, Sketchup, Poser Pro 2014 Game Dev SR5 on Windows 8 Pro x64. Poser Display Units are inches