What is your concern?
Don't expect those air guides to be stiff. They are thin plastic and oddly shaped to wrap around the bumper reinforcement. They bend easily and I'm not even sure they're held on by screws - I think they have a couple of tabs that just interlock loosely with openings on the frame.
Here's a pic from the top and front. I've outlined the pieces you are asking about.
__________________
2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |