Replacing the headliner in my CF5 moonroof car Regal

[turbotimmer]

I bought a new ABS headliner for my 86 T Type. Car has a factory moonroof car. I'm installing a 6 point rollbar now, and will be putting the new headliner in after the bar is complete. Question is, how does the material go in around the moonroof? When I removed the old stuff, it was sandwiched between 2 pieces around the hole that don't appear to come apart. Any help would be appreciated. BTW, I have the rear window out, and that's how I plan on putting the new liner in.

Thanks