Well that does not look like fun. If the fuse panel is not repairable, the first thing I would do is look over the item you want to replace and see if there is a manufacturer name and part number marked on it. If there is a part number start Googling; if not, it is likely a Thor provided part (as opposed to a stripped chassis Ford part.....but not certain about that). You could try contacting Thor for the part number and since they donít sell retail (and you are out of warranty) you can ask them for a local Indiana Dealer (used to be Lazydays RV I believe, but they changed hands so may not do that any longer) who might quote, sell and ship the part to you.
Failing that you can try RV wreckers and see if anyone has your coach etc. Attaching a link for by state wreckers that you might be able to try.