67 Notchback Cuda

I have a 67 Fastback with out the stainless trim but rather the plastic strips. The previous owner had some type of strip stuck in there just to keep pressure on the window gasket. I switched it out with a different type plastic strip that looks much better now. In order to change over to the stainless trim the glass has to be removed and clips installed that holds the trim in place. That's what I've been told anyways. So I said heck with that and pushed in some plastic striping around the front and back glass. Why ma Mopar did some thing like that just in 67 and then not in 68 or 69 beats the heck out of me. I guess 67 was the introduction of the new cuda and they saw that the plastic trim was more a pain than the stainless.