I have a 73 that has rust at the bottom of the rear window. The rust below the window and has rusted through the interior panel above the package tray. Does anyone make a replacement panel for repairing this? I have found the filler panel that attaches between the window and the trunk lid, but nothing for the interior. Thanks for the help.

If you are talking about the piece that is somewhat rounded and is where the back of the sail panels attaches....I have never seen this in reproduced. Best bet is doner car....I believe they are the same from 70 to 81.