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Most RV shops or dealers have a number of various mounts available.........both fixed and on moveable arms. The one you choose depends on where you mount it and if you want it to pivot or not. I am not at my shop right now, but when I get there later I can give you the names of a few. I suspect that Amazon and E-Bay have some listed as well. The price varies so you can shop around. If you are somewhat handy with tools, these aren't that hard to mount up. Hope that helps. Please get back to me if you need more later as all follow ups are included in our fee.
You might add a photo or two to your post using the paperclip icon so I can see what you have. That could help in my assessment of the situation. Do you think it is best to have it in a fixed postion or on a swing arm mount?