Halloween special demon
Here's a couple threads on orange/black demons and dusters. The Halloween reference came up a few times, but they were colors that were available as regular options. So, it's not a factory Halloween option package, just an orange and black interior option. But I'd be willing to bet there were probably a few dealers that might have advertised an orange and black car like that.
Ever see a BLACK/ORANGE 71 340 Duster??
71 318 Demon