Well, I cant' tell you the model #, but have a question for you. I had a "factory" 86 astroroof GN. The factory roof did not "pop" up in the rear, it only opened by sliding back. There were some dealer installed roofs that had the "pop up" function. So, which do you have?
I can tell you that the "factory" roofs were pretty common and there are lotsa cars in the boneyard if you need/are looking for parts. Any 80s GM car. Caddy's had them, Olds, etc..they were all the same.
Joe