Call Phoenix on what to order. It is possible that Phoenix installs a made-for-Phoenix awning to accommodate the non-flat wall, or they install a standard awning but utilize two additional custom-made filler pieces to work with the wall. I found this picture on-line which shows what appears to utilize filler pieces.

The easy solution is to install another box awning, but naturally you will miss out on the conveniences.
Back in 2005, it was popular for Phoenix to install a short box awning. We paid extra in 2007 to have the box awning cover across nearly the entire side of our 2350 which is very nice that it covers the bedroom window and the storage compartment below it. Here is our box awning closed-up. My point is "bigger is better."

The convenience of a fully electric awning is hard to beat, but I like the clean lines without the tracks and all the extra mounting holes in the body. I have no ladder of roof rack for the same reasoning.