Worse case, check out rockymountainatv.com. That's where I got mine and it came with the plastic piece you are looking for. It's not the slim version like the picture you showed though. If that's your deal breaker I'm not sure if rocky mountain will have that version. Mine doesn't seem to loud and I don't hear it unless I'm sitting still, and even then it's not much. I have mine mounted up though and cut a pass through for the discharge port to go through the back side of the roof. It's not pretty but I wanted the unit out of the cab, and above the roof line. Maybe that helps with the noise.