Hello, I got a nice V40 from 1996 with 85 kw at 225700 km into my hands. The good piece comes from loving hands we look good, got TÜV a year ago without complaint and is well maintained. Runs clean, everything well except for a little rockfall on the hood and a few small scratches/macks. Unfortunately he does not have a roof rail but only on each side three recording points (grey stoppers in grey plastic profile). Since I want to mount a roof box, I probably need the rails. Is this for subsequent installation (without ripping off the roof sky) or is it such a plug-in system…? And is there the manual somewhere to download…? Thank you! …it is my first Volvo!