1966 Dart GT-it begins

This might be of help to you. LH / 1963-66 DART REAR QUARTER-LOWER REAR SECTION

You might also want to check with Layson's. They are a sponsor here on the site and I believe they offer a discount.
That panel does not go up high enough. In fact I do have it. I reached out to Lee as you suggested. That section the same on 65 and 66 he said. His is 65. Just waiting in more info and how to get here. Thanks again.