Here you go buddy. I didn't know which one you were looking for, so you should be able to find different interpretations of each helmet in this thread, just click the link below. If you're going for Carter, I strongly recommend Ruze789's helmet, as it already has the side attachment in the file. Good luck.
up to you if you want to use a respirator. But I do recommend using one to be on the safe side. make sure to get one outfitted with organic vapors cartridges.
I use the P100. I've never used the N95 though. P100 stands Particulate filtering 99.7% of organic vapors. And the N95 stands for non-oil based filtering 95%.
Though the P100 costs more, it's better to be on the safe side. But correct me if I'm wrong though. And I just wrote a novel.