72-73 duster sheet metal

AMD reproduces both of those parts in case you didn’t know. Here is number 20.
Body Components - Trunk - Trunk Floor Extensions Body Components - Trunk - Trunk Floor Extensions
The other
Body Components - Tail Panel - Reinforcement Brackets Body Components - Tail Panel - Reinforcement Brackets

They are sold individually. If those aren’t it I’m deep into a couple cars and may have some of those rear pieces