This is the parts info for your RV:
https://catalog3d.winnebagoind.com/2015/15ifa26a.htm
Drilling down further,one can get to this for the front two seats:
https://catalog3d.winnebagoind.com/2015/18857902.htm
If you click on an item in the drawing, it will pop up on the list at right with the "official" part number!
Or if you want to spot it on the list and click it there, it highlights in yellow on the drawing.
Then if you choose to go that way, there are several dealers around who may be able to get the OEM cover if new and lucky enough to be stocked?
Good luck with the chase. Hope this gets you started?
Note that one can do all kinds of searching /looking at what and where things are on the RV.
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Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!