Where do these gaskets go?

Thank you. That's what I was figuring. Just seems weird to me that they'd use a gasket at a point where it doesn't really matter if water gets past that surface.

On a '72, do those mounting points go through to the trunk interior? I don't believe so, but I'm not 100% sure. Thanks again.
IIRC, yes on the '72, and the foam washers may be used to help prevent squeaks & creaks as well as seal.