I don't know about motorhome salvage yards, but you might try www.recycler.com and even place a want ad on there. I once placed an add for some obscure Mopar parts and got tons of emails and calls. I hope this helps you out.
there was a member here that had one for sale, it was not used he just never installed it in his car.
I don't remember who it was, I think I have an e-mail at work. I will look tomorrow and post if I find the e-mail.
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