Just tried the same before I saw Krullmeister's pic. The 120mm fans fit up top because the mesh is recessed down. You have ~20mm of depth between the steel & top surround without dropping into the mesh section, but the shape of the Spectre Pro mounts would cause the fan to just barely sit on the edge of the inner ridge of plastic top shell (as you can see in Krull's photo) and lift it up further.
I also tried the factory 200mm fan; since it's only 20mm, it also would just barely hit the plastic in the center (easy dremel fix). However, using it would require spacers between the top plate & the mesh so the fan housing doesn't warp when you screw it down; but then you'll run into interference with the plastic frame for the mesh grille.
Gave a thought to a 180mm fan, but you're looking at approx 165mm max width for a fan to sit down into the mesh section...