What are these parts called?

[ammophobia]

Well, I got into a minor accident a few months ago, damage was on the car's front, insurance took care of it and it was repaired at a body repair shop. Things was okay, just bodywork, no damage to the radiator, no harm to the radiator or engine. Yesterday I was taking the car to replace the HID system (it came stock with the HID, it's been 3.5 years and the bulbs are starting to die). While the mechanics was replacing it, the front bumper was taken off and I saw some parts of the car (feels like it's made from plastic) look like they're chewed. Probably because of the impact of the collision. The steel frames were okay but these plastic parts can't withstand the impact. Here are the pictures:





What are the names of the black plastic parts that I circled red in the picture? Part numbers would help too. And do the middle one and the side one have different part numbers? Should I replace them or should I just ignore them?


I also would like to ask, which one of these two is the airbag sensor?






By the way, the HID work was pretty neat, here's the end result:



Help would be much appreciated. Thank you very much :).