I DO know the answer!!! My friend and mechanic pointed mine those out when Blue was up on the rack one day. That is Dodge's way of fixing rattles without redesigning! They put those rubber donuts on or weld metal blocks on pipes and parts that rattle so we don't hear it in the interior. I have 3 or 4 on Blue. Kinda cheesy that they "fix" things that way rather than redesign the flow of parts so it is more stable!:shakehead: