Re: cj-5 windshield frame
It'll fit but why do it? Most folks swap out the 74 style windshield for the newer style 76-up windshields. You can pick up a 76- up replacement w/sframe with glass for about $150-200 around here. The length of both style the windshields is the same. You'll probably need the w/s hinges off the 74 and may have to drill a few new holes for the hinges to mount right. You'll also have to deal with the brackets, you may have to use the 74s. The 74 w/s will also sit up at a straighter angle on the jeep than the 78's sloped back look.
Hope this helps.