Lookin for factory full a body trunk pan
If this one will work - 68 Valiant FOUR door, (is the same) and if you can pay for labor and shipping, maybe? it could work.
Would have to be palletized and go via Truck Freight - Pilot, YRC, AAA Cooper, etc. All firms I have sent palletized loads with.
Probably would be easiest to simply hack off the entire rear clip off the thing, and then trim it. These are older pics, the tail lights and most of the loose parts in the trunk have been sold, but the trunk floor metal condition is still the same - good.