I see on the first page of the brochure for the 2011 Vista that there is a upward-lifting hatch for the TV. I assume that your TV also swings-out; is that correct? If so, you should be able to remove the old TV screen and measure the mounting capabilities of your bracket.
As your vehicle is only twelve years old, I believe pretty much any new TV can be installed on the existing mount.
Welcome to the forum.
2019 Minnie Winnie 22M on an E-450 frame
Thanks for the welcome and your reply. The tv does not swing out, would be
great if it did. Its actually bigger then the opening. Hope once I remove screws
holding it in place can angle the bottom of the unit out and remove. Figured I
would ask on this site if anyone has replaced one. Thanks again !