Car seat help!

So I have to fit a bucket car seat (sometimes two) and a forward facing car seat (sometimes two) in the back of my car my son is currently in a evenflo gold forever car seat but it takes up a seat and a half in the back of my car! I am desperately in need of super narrow forward facing carseat (bonus if it has the headrest that comes out and around the head in case of an accident) that’s not going to break the bank as I’m definitely not rich.

Any recommendations are appreciated as I’m due in may and cannot find a carseat that I like that is also narrow.