I have not done it myself, but it looks like a few clips along the top, bolts either end. Probably a few clips on the under side.
Just removed one of the clips along the top and they are 8mm holes. They look the same as the arch liner at an initial glance, but not measured.
As an emergency, you could probably get away with using a few zip ties in key locations. if its been ripped of, the original mounting holes maybe damaged so I would take a drill to make new ones!
Some screen grabs from the service manual:
[ATTACH=full]75597[/ATTACH]
[ATTACH=full]75599[/ATTACH]
[ATTACH=full]75598[/ATTACH]
