I Google it, too. I actually saw it both ways. I think it depends on your emblems. If you have the emblems made to fit on top of the character line/crease of the sheetmetal. It probably goes up front. But if you have the 'flat' emblems they probably go lower on the fenders in front of the doors. I'm pretty sure I remember the ones in front of the doors. My parents bought a new '65 GT and I bought a new '68 GTS, so I was kind of tuned into that stuff.
What's kind of interesting is I see a lot of pictures of 67 GTS's, and I don't remember seeing them at all. My friend had an original '67 383 Dart and nowhere did it say anything other than GT.