1972 Duster/Demon Slotted Rear Bumper Dent/Rust Free

I am looking for an extra nice 1972 Duster/Demon rear slotted bumper.No bumperettes.Must be straight and mostly rust free.I plan on having it re-chromed,just want a extra nice core to start with.I'd pay up to 300.00 for the right one or have a new in the box AMD bumper to trade.