the 69 vinyl roof style uses a unique belt mldg which allows the 69 model cars to show a small portion of the painted surface of the roof around it's perimeter. whereas the 68 style roof shows no painted roof and the vinyl roof material actually goes under the windshield and back glass reveal mldgs.
perhaps someone could post a few pic's to demonstrate the differences? if you look at the factory pic's of the two models 68 vs. 69 the differences will be apparent to you, hope this helps.
