I was doing an oil & filter change and a fuel filter change on my 2012 Ram 3500 the other day. When I reached down to put the socket on the fuel liter cap I heard a clank, clank, thud. When I looked under the truck there was a C shaped chunk of steel laying on the ground. It's 2" long, the outside diameter is about 1-15/16" and the inside diameter is about 5/8".
I just changed my muffler bearing, so I know it's not that!

What is it and where does it belong???