Just bought a Debus air canopy but now its here apparently its made to fit a c-channel rail and we have a vanX rail the same as the VW rail that's on the side of the van. It makes the air canopy too low and so the sides don't fit to the van and it's all baggy, not much good in the wind. Tried raising it with cables tied to the pop top but it's fiddly and not a great solution. Anyone any suggestions on how to make it fit or alternative air canopy's that fit with the lower side rails. Very frustrating.