Taxi Driver Online

Does anyone know where the fittings which attach the sunroof runners to the roof are? Perhaps under the headlining?

I'm trying to get one of the worms free as it just won't budge, however when I undo the three bolts on the top of the runners, the metal just wont come up, which makes me think there must be another attachment which I can't see.

(Not expecting sun any time soon, but it's been bugging me for ages and I have a free Sunday...)