Indeed, that's it. When you get your bars, you will see how simple it is to fit.
Tip: if the bars have locks on them, make sure they are lubricated. i had hells work in the summer trying to move my bars to accomodate a roofbox as they wouldn't unlock.
Plenty of WD40, time to let it work and brute force solved that. By then, i decided not to take the roof box