That's a tough one. Just keep an eye on E-Bay. That trim piece is costly as it's a one year only thing. Maybe you can make your own gasket out of something? I say this as I bought a set of repros. I think from Year One. They weren't near thick enough, so exhaust fumes came in thru the trunk.
I finally found a nice set on E-Bay, and all is well as I don't stink like exhaust when I drive anymore.
Mike