You know that the GT is the narrow-body. IIRC, the tail lamps assys are all interchangeable. If you take a look at the corners of your tails, the body flares around the assembly. I'm almost positive its not the other way around.
Convertibles are the same as the coupes, only difference being between 90/91 and 92/93 the mounting method is reversed. In 90/91 there were clips on the lights, and bars on the car, 92/93 it reversed, same parts though.