Yes, the sliding part is part of the headliner, not the sunroof.Kind of off topic but I am very curious. When you had your headliner out and you were cleaning drains, could you tell if the sliding door under the moonroof was integral to the moonroof unit?
In other words would it be possible to remove the moon roof assembly while retaining the sliding door that is underneath it?
The few that have removed their sunroof and welded in a blank have a new secret storage place for stuff.