And once you've seen them installed, it's pretty easy to tell the difference. A stock one is going to have some slack, but not that much. An extended one is going to have a very noticeable "dogleg" shape when the Bronco is just sitting on the ground.
And since there were not that many stock-length braided stainless hoses used, if you have a braided hose, it's probably better than a 95% chance it's extended length.
That's all just fluff though. Garberz gave you the straight dope right there.
Paul