Fixing broken headlight housing

[monicaownsayaris]

A deer hit our Yaris the other day, but we hit its back end and managed to walk away with just some bumper cover cracks and random broken plastic along with a dent in the fender.

But the headlight housing came loose, and upon further inspection it cracked at all 3 bolt spots. The headlight is completely fine and works and all, but we can't re-attach it since each area on the plastic housing that gets bolted to the car cracked off.

So my question is, would I have to buy a whole new headlamp assembly or could i just replace the plastic casing that holds the headlamp with the bolt holes??? I really don't want to have to spend $60-80 just because some of the plastic ripped off.