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Thank you Steve for the references, I actually think the "unicorn" panels found me. I received the below message a few hours ago and replied to him that I happen to have a nice oem set of black D3ZB panels put away. I purchased them around six years ago not realizing the 71's were different from 72-73. I will post up later to report the result.4mm, trying to find decent and affordable used interior quarter trim panels has become another one of those 71-73 "Unicorn" parts. Most of the ones I had in parts cars and ones I've seen in salvage yards were in pretty bad shape. Most would disintegrate into a pile of powder when touched or had speaker holes that appeared to have been cut out with a chain saw!
There was a forum thread here earlier (7-22-13 to 3-2-17) discussing some interior product offerings from MP Products. I don't have any experience with this company so I can't offer opinion as to the quality or fitment of their offerings. I have posted a link to that thread so you can look it over, and a link to MP Products. If no one comes up with any original pieces at least you'll have another source to consider.
Good luck on your search.
https://www.7173mustangs.com/thread-interior-reproduction-parts?highlight=trim+panels
http://www.mpproductsstore.com/radiator-masks.html
PM sent.I have a single side, not sure which side. PM me if interested