its not a part of the actual headlight. its the bracket that holds the headlight onto the car. if its broken too bad you can get a new bracket without having to replace the headlight. or you can try to ghetto rig it like whoever owned my car before me did. not sure what to tell you since i dont know whats wrong.
you can try to find one in the for sale section since alot of time if people are selling headlight they sell the brackets with them. or you could try morad.
http://www.moradpartscompany.com/
