Rear Fog Lights and Casings.

[B-Ready]

Hello. 

First post here.

I recently reversed into someone I know playing the "How close can I get?" Game. 

Safe to say I busted the entire red plastic off of the fog light and smashed the bulb.

Anywho my question is, where do I buy the whole unit? And how easy is it to replace the broken casing? 

Thanks in advance 
B