Hi, Would anyone have a diagram of an electric sunroof for a 1976 Pontiac Grand Prix?

I have looked in the 1976 Fisher Body service manual, but it shows a totally different sunroof

What keeps the sunroof lid attached to the the sunroof frame other than the four screws at the front.

On the car I am working on, there is nothing to keep the rear of the lid attached to the sunroof frame, so the sunroof lid is getting scratched by the roof when it is being retracted
Any diagrams or pictures appreciated

Thanks

EJ