Chevy Malibu headlight trouble

Question

I have a 2004 Chevy Malibu classic that had a burned out low beam headlight. Went to replace the headlight with the bulb I was told by an auto parts store and it didn't fit. I looked at the old bulb and it wasnt the same size. I did some research and found that the size that was in there is actually for a 2003. Well I went and got the right bulb,put it in and it still doesnt work.

A.) Why do i need 2003 bulbs for a 2004?

and

B.) Why would it still not work after a new bulb?

Answer 1

2003 malibu headlight fuse