I have had an annoying buzz/rattle behind the seats in the Camo Comanche.
Tried numerous things. It wasn't the seatbelt upper pivot. Not bad clips on the panels. Not loose speakers.
Last night I removed my bucket seats to install new covers.
I decided to remove the B pillar trims.
What I found is there's a metal "bucket" behind the seatbelt retractor that was installed using dum-dum aka strip caulk. Kinda reminds you of those recessed toilet paper holders....The dum-dum had dried up and these "buckets" would rattle against the metal part of the cab.
I fixed one by adding new dum-dum, and the other by running a self drilling/self tapping screw through the lip on the bucket and into the B pillar metal.
Road tested it today and the noise is gone.