Here's is another version showing the 2 pc grille attachment. (The first photo was in reply #6)
This time the lower 2pc grille is attached on the back side lip of the nose support, same side as the upper grille.
The 4 screws that hold this lower grille appear to be in the slotted openings for adjusts left to right.

I would like to add that , the lower grill does not typically bend forward as the picture shows. The lower grill appears to be installed down too far. It appears all the way down close to the fiberglass surface in the picture which means it was bent forward to fit the space. It is also missing the plastic extruded channel along the bottom. I was just afraid someone might copy that because they thought it was supposed to be that way if I didn't mention something.
Bob,
Thanks for pointing out the incorrect
bent lower grille and its missing paint protector / plastic extruded channel. (I should have mentioned that.)
If the lower grille is moved up one row to fix that problem it would be overlapping the upper grille. This raises a couple of questions that I didn’t get a chance to ask JD off line;
-Would the 2 overlapped grille pieces mean the upper grille is also too low? (hidden by the channel over the top of the grille)
-Or, were there two different grilles used to ensure a proper fitment and no gaps?
(I previously read they were cut in 2pcs, but I'm not sure how that could create an overlap unless both pieces were moved)