I specified roof rails, but had them removed at delivery not wishing to have them on the car all the time.
The problems occurred when last week I attempted to put them back on. It took a massive search to get the on-line instructions (the dealer couldn't help). I then tried to follow the re-installation instructions but they didn't make sense. I called in at the dealership for help and they tried, using the instructions, but failed. They told me I needed to use the allan key supplied with the car (which I did not have with me because the instructions advise that it is not necessary for removal / re-installation). They didn't have one but told me I'd have no problem doing it myself.
I have just spent an hour + cuts and scratches on my hands + a scratch on the car trying to get them back on. It takes brute force (standing beside the car on a self-standing ladder) to get the cover aligned sufficiently to turn the locking key, and then to get the key to turn.