Roofbox.co.uk say that in principle, any box should go on any pair of bars. I put in an i10 on their site and the Cruz bars (either steel or aero style) are straight?
Are you referring to the roof curve, across the vehicle, side to side and front to back? The vehicle specific feet should cater for that but I'd ring. It looks to me that a box would be "nose up".
Not sure I understand the question correctly, but.
if you mean the car roof curves front to back in an arch, then this is not a problem
If you mean the side ways on shape of the bar is not flat on the top edge, then this is also not a problem.
If you mean the bars describe an arc going from side to side of the car, then I doubt it would be enough curve to cause a problem either.
The only problem I found with my roof box, was the plastic is a bit flimsy, so I put plywood runners for the box to sit on so there was a good spread for the weight of the box and contents to sit on. The clamps pass through the wood before attaching through the box. Hope that makes sense.
PS I was typing this whilst the other reply was posted
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