Hi you could try these guys.....link below.....in Washington state. I think they actually manufacture wiper systems and parts and may even be suppliers to the RV and other vehicle builder industries. Somewhere on this forum I think others have had wiper arms made by these folks. But this is not the kind of “work” you wanted to go through from your comments.
If your old wiper arms are still structurally strong and not cracked or bent, why not try to refinish them yourself or have a shop powder coat them? Failing that I will be surprised if any regular auto retailers would have specific RV wiper arms stocked.....but never say never.
https://www.amequipment.com/home
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