I know there have been many posts on the entry points where the water gets into the Vectra C, but I've just removed the plastic roof trim strips each side, to allow me to remove the riveted plastic trim clip at the back just forward of the tailgate on the hatchback model. I have sealed under the rubber washer and the plastic clip itself, and have riveted the clip back on.
My question is, do the two metal blocks on each side also under the roof trim strips for the roof bar attachments also need to be sealed as they do also have a rubber washer beneath them but no visible way of removing them.
Your help is much appreciated.