1968 Dart GTS Tail Panel

Just saw a set of tail panels on FABO for sale, one for a GT and one for a GTS. Seems like Dodge used a variety of tail panels on their different Dart models from 67-69, so I am confused. My 68 GT has the all-silver reflective panel. I was looking at the panels for sale, then started looking at images of GTS models, and they do all appear to have the blacked out rear panel. Is this the only panel GTS models came with in 68? Curious, as I am going to clone a GTS and may now need to swap out the tail panel to the correct one. Thanks for your help.

This is a correct 68 GTS Panel

View attachment Black Finish Panel.jpg