My new-to-me Vibe has some chirp / rattle seemingly coming from the exhaust header / manifold area (I previously thought it was the torque converter because it was more prominent in D and R, but the sounds seems to be clearly coming from the manifold area). I got up under there today and noticed one of the bolts holding the lower exhaust manifold heat insulator seems to be missing (see pictures). There is one on the opposite side, so I assume there's supposed to be one here as well. I'm not positive this is the source of the sound, but does anyone know the size (thread count, pitch, etc) of that bolt and if there is a nut on the other side or if the manifold is threaded in some sort of way to accept a bolt?
I also noticed some sort of rubber "stop" just below the manifold area (in pictures) - is this normal? Just want to make sure it's not a part of something that broke off.