Photos please
this is typically what I see for retainers. On later years I see a push in retainer that the posts push into.
I can not say for sure on the GTS badge but 67 GT and V8 and D O D G E letters they all use a nut like this
View attachment 1715529287
Also can't say I have ever seen a GTS emblem on the door, front fender in front of door yes
View attachment 1715529295