This pretty much what I will be test fitting in the next month. I have an NOS 9 series fog eggcrate grill, and non-fog E codes enroute from the Netherlands. If it fits together will add a pic to this thread. Plan B is a non fog waterfall......and I suppose there is no plan C.
You do know that you will have to remove the egg crate insert which involves drilling out rivets? I would buy a cheap egg crate grille to mess with and not mess up a NOS grille(or sell it). When you have both grilles together, you will see how easy it all goes together. I used nuts and bolts to secure the egg crate insert in the grille frame but I suppose you can use rivets too(I had some but didn't bother looking for them).