Not off the top of my head, but if needed I'm sure one of us can measure a known-good one.
But curious why the need to know? If it's a Bronco top shouldn't it fit? Or is your question geared more towards whether or not your body is so messed up that buying and fitting a hard top would not be worth the trouble?
Are your door gaps good? Body lines and door lines line up?
Are your tailgate vertical gap lines straight/parallel? If so then the body really ain't going nowhere. Nor should it need to. If you need to pull it in or out to line up with a top, the top itself should be the more flexible piece and pulled or pushed to fit the body.
And if the body is not to spec, would you have plans to correct that? Or just pass on the idea of a hard top altogether?
A proper Bronco top for '76 would have had the full stake-pocket anchor brackets (I'm sure there are pics around here somewhere) and those would also serve to hold the body and top in at least close to proper alignment.
Granted, a lot of Bronco bodies have taken a beating over the years for sure. And I've seen some real doozies that should have fit, but didn't come close. Don't know if it was an issue with the body, or the top.
But if those other panels on yours are still lining up fairly well, I would think a top would fit fairly well too.
Paul