Hi, my 98 eldo has an asc moonroof that was installed by the previous owner. It looks and functions almost as well as a factory unit would. My problem is they butchered the headliner and it is starting to sag in the rear. I would like to try and replace it if possible but I need the stock dimensions of a stock moonroof to see if a new headliner would even fit. Thanks.

I know this doesn't answer your question, but have you tried to glue your headliner back up? I have had very good success with a can of spray 3m adhesive and my old headliner. Makes a world of difference.

I am going to try that first but when I push up the headliner to the roof it seems like they cut out some of the headliner or it is not all there because I have to really stretch the fabric to make it sit flush to the roof panel. The sagging headliner doesn't have very much slack if I try to make it flush with the roof.