Pocket door that doesn't require much overhead space
Go to a real door supplier and see what they can offer. 

You'll be removing any top framing from the pocket door kit and bolting the track directly to your opening (which will take a little bit of thinking, but that's the fun of this kind of project, right?), so that'll change the height. Even if it didn't, a 76" door isn't that terrible. (It's only a touch lower than typical.)