I looked up the repair panels and discovered that at least three of the usual suspects carry that rear deck part beneath the window.

Robert, since you've had this done, can you tell me how the new part attaches? Does it underlap the quarters and spot welded in or what? You say you would recommend repair over replacement. Were you less than delighted with the repair part fitment?

I noticed that Ames offers two versions. One is the FK381 which is the part you see from outside of the car. The other is the FK380 which they call "Rear Seat to Trunk Assembly 1/Window to Trunk Panel"

Does the first piece include the window channel surface? What extra is on the more complex part? It looks like it is including the rear package shelf, but the photo is tiny.

The lower molding is flooping around loose on mine, so whatever the molding fastens to is rusted away. I'm trying to recall from working on my 68 thirty years ago; aren't there metal pegs that look like the top of a common nail that the molding clips attach too?