Im new to HIDs and I got my hands on a set of headlights out of a 2008 nissan altima that had HIDs in them. I have the ballasts and bulbs. Is it possible to wire it up to my cobalt? If so how hard is it and is there anyone who can give me instructions.

 

bulbs are a different size so no. get projectors and a proper HID setup

 

If you have the projectors and the bulbs with ballasts you could retro-fit them into the stock housing. But from the sounds of things that maybe out of your expertise.