I'd think you would have to find one first, then fab it to work on a CJ7 tub. Or just fab one of your own? Hate to be the party pooper, but you'll also need to check with your State's MVA/DMV. Most States have restrictions on windshields that can be removed, hinged or are not permately attached, the materials they are constructed of, what driving conditions they are permitted and the additional saftey equipment required during their use.
-Just a thought