I think the roofrail fitting requires the A,B,C, and D pillar trims to be removed, which in turn will allow the roofliner to drop, then you can access the bolt holes where the bolts screw upwards through the roof into the rails. This is great if the holes are there, there could be a paper pattern to mark the holes from above the roofafter the removal of theplastic strips. Concerns are paint the holes if they are drilled so rust is minimised, and there are side airbags (curtains) along the tops of the doors these are exposed when the roofliner is dropped so exercise caution for this operation.