I have installed the lower front grill. It took a few modifications as the instructions call for it to be mounted outside the existing grill, which seemed like a really bad idea for airflow. So I removed the plastic grill and cut off the solid triangular ends, remounted them on the car, and then screwed in the Zunsport grill to those ends. The supplied screws are long, but do not get near the ic. I did not use the clips on the grill (they are too short and pull in the center of the grill out of line), but simply bent them up so as not to scratch the plastic lower bumper. Works fine so far: seems solid enough, lightweight, far better protection, with good airflow. I painted the vertical plastic mounts for the original grill matt black (black ic) and it looks great. I'll post a photo when I'm done.
Waiting to install the upper grill when I pull the nose off for some other work as it seems to be attached from the inside (unlike the Euro version which just pulls out).