Robin, maybe a picture might help. I have an idea of what your asking about, but your technical verbage is as bad as mine. Though I would have probably said, that do-hicky thing......
Anyway, Welcome to fiberglass rv..... Glad you joined us!
If what you are looking for is what I think it is, you might be able to get one thru Camping World... But there are other options as well. So pic's might help us get you to what your looking for.