I have one sitting in the garage that makes for a great door stop (don't have to bend over to pick it up).
Like they mentioned, shipping will the the bigger bullet to bite.
Be aware there are 2 different arms. The '66-77 Bronco has a different bolt spacing for the spring plate then the '78-'79 Bronco. Not sure how the truck versions fall into this? Really not that big of a deal, worst case is drill a new hole or two for the spring plate. That's it.
If that arm died, figure the other isn't far behind. Be looking for a pair.