Advice wanted on an awning for our van conversion

We have bought a van conversion motorhome which has a 3.5 metre Omnistor windout awning fixed on the side.  The awning rail on this is 2.5 metres high from the ground.  We are wanting to buy a drive away awning but notice that most are to fit vans from 1.8 to 2.2 metres high.  Can anyone recommend one that would fit our van please.  Being a van conversion it also needs plenty of space for the side sliding door to operate.