I have an 841 gas job that had a 4000 engine swapped in before I got it. It was missing the air cleaner assembly but am confused on which one I need. The carburetor has a 2" opening. I ordered the air cleaner assembly online for an 841 and the diameter of the breather tube is too small. The air cleaner they sent also looks like an NAA one to me. Do I need the 4000 air cleaner and the right angle air cleaner tube for this application? Thanks!