Ford has not made parts to fit this area yet. I actually got the parts from a SWB passenger van that have the correct shape but do not have the proper attachment to fit in that area.
This is one of the things I brought up to the Ford Transit Brand Group and they have not replied to this situation. I will send them your request to remind then about my original request. Will let you know when they send me a reply and if the parts for that specific area will get engineered and be available for purchase.