Im updating my front end to 2017 from 2014. What is the rectangular hole in the front grill specifically for? What is the part called? I think its a camera but I can't find the part that will bolt in to fill the hole.

 

The big rectangular hole you can put your hand through then that is the cover/badge that fits in front of the ACC sensor on the 2016+ models. They use a flat plastic cover rather than the contoured badge. C2D35915 goes with the chrome grille, and C2D35916 with the black grille. There are no bolts - it just clips into place. You can get the main grille without the ACC sensor that takes a normal round/contoured badge if you would prefer that look. (It might be cheaper to get a new grille than to get the insert.)

The smaller hole right at the very top is for the camera.

 

Ty. You're a brain beast!