WTB: Cargo / Treasure Chest floor sections

Long shot, but if anyone has any cargo floor sections they want to part with, please let me know. I only need the rear-most 1/4 to repair some rust under the fuel tank in the treasure chest floor of my 55 single cab. The main floor is ok, looks like fuel spillage has caused it to rust under the tank itself.

I just need the part in the red box, can be new or used. If you are cutting up a bus, then I think any part of the cargo floor will suffice.

If you have any cargo floor repair panels you are not using, then that would be even better.

Thanks

Steve