Question @ Fender to Body Gasket

The fenders were removed by someone else, then the car (69 Dart Swinger) went to the paint shop.
I bought new metal splash shields and rubber gaskets that go behind both front wheels. At the same time a "C" shaped gasket was listed as a "fender to body gasket" and as a part I needed. The question is where the heck does this gasket go?
Thanks.