Ahoy there ssba....I like the cut of your jib :)
To the young man with the questionable old Duster, I offer this advice. Yeah, your car has parts of a few different Dusters in it. So does every other Duster, including the ones owned by the noisy owners here in this thread.
Cover your rear parcel shelf up, put the speakers in, register your car and enjoy it until you sell it. I'd buy it myself, if it was a Demon. There are thousands of cars out there just like yours. Dime a dozen. Over one million Plymouth Dusters were made, no-one cares about your VIN. Hell, the Demon I bought just last month could have two VIN's, but I'll never know unless I tear the interior out. Understand this....of the 300,000 Plymouth Dusters out there (700,000 have been melted down and turned into Toyota's), only about 100 owners would know that Plymouth Dusters have a partial VIN on the rear parcel shelf....and those 100 will never see it, unless you show them.
Do not ever post under this username again. Let the dust settle, join up under a new name, locate yourself in a different town, and introduce yourself to the fine members of FABO as the proud owner of a small block Duster.
All will be well, and you can sleep easy knowing that the VIN Nazis are none the wiser :)