I know what you're talking about.....been with my '87 GN since new and the glass tops have no trim around it on the three sides....just the large metal edge that goes towards the outside of the car that contains the lock and weatherstrip.....I, personally, have never seen a Grand National with the trimmed T-Tops......the untrimmed ones on mine have been on since new. I've seen the trimmed tops from a Monte Carlo and Cutlass, matter of fact, I have a set of Cutlass T -Tops as spares and they have the black trim around the three sides.....they were hard to fit on my GN because of the extra thickness of the trim pieces so I just store them in the garage. I don't know where you can find these trim pieces except off of a wrecked Cutlass or Monte Carlo T-Top.
Bruce '87 Grand National