Wanted- Squarestream propane tank cover

[Kinnebrew]

Hey guys- writing from the Bass Lake Rv park in California.
While pulling my trailer up the mountain to get here I lost the propane tank cover of my 89 Landyacht. Don’t know where to start trying to replace it as my rig is pretty rare and the propane tanks lay on their side.
I believe Avion made a similar Squarestream model, so possibly its tank cover would work on my rig. But even with that there are not a lot of my model airstream out there.
Can anyone help me track down a propane cover?
Thank you for taking the time to read.