Hi, Yes I have roof bars on my bmax.......I think the rails may only fit the specific roof bars that you can buy from the ford websites...that is what I ended up having to buy to attach to roof bars....expensive but the main outlay was the rails
I could then fit Thule cycle racks(if that's what you want it for) to the ford bars
The bars I have you can find on e bay under genuine Ford roof bars b max....I shall take an image of the foot of mine qtomorrow for you as the e bay image does not show the foot clearly
The bars are slightly different lengths. ...
the rails I fitted myself. ..I think I paid just under £300. It was not hard but took a little time. ..not technical really