Engine Intake Resonator Bolt

There's a bolt attached to the frame on the left front side (when you are facing the hood) that holds the air cleaner inlet. Is there supposed to be a nut that goes with that bolt? If not, how does the air cleaner inlet get held in place to that bolt?

I was doing some cleaning and I might have lost the part that secures the air cleaner inlet to that bolt. The ring from the inlet is currently just slotted into the bolt and I think it's causing some rattling noises when I drive.

The air cleaner inlet that I am talking about is 17750-37010. I also attached some photos of the bolt I'm referring to (one with the bolt on and another with the bolt taken out).