I was driving home @ 3 in the morning and hit a cat. It was really cold and i guess the plastic was hard as a rock. When i hit the xat it did a lot of damage. All the black plastic pieces were broke at the very bottom beneath my grille.

The under cover is busted, the black bar that goes around the tip of the car that the under cover connects to is busted, 3 out of the 4 brackets on the back of the grill are busted and the piece connected to the v is busted.

Should i just get a new bumper?

 

Go here to identify what parts you need for the repairs.
http://www.trademotion.com/partlocat...layCatalogid=0
This comes from one of our forum supporters OnlineMazdaParts.com
The other option is to call another one of our supporters, Mazmart. They sell used parts and may/may not have what you need in stock.