The answer is that they are different for each year 67, 68, and 69. I was able to make 69 Dart tail lights work in a 67, but 68's would not. There was some drilling involved with the 67 go 69 tail lights. I have owned more than 50 of each year and and have found out that a lot of sheet metal parts are different.
Thanks to both of you for the info. I guess it would probably take as much time to adapt the 68-69 housing repro pieces as it would to fabricate repair areas so I’ll just let the body guy do his thing.