Try partsexpress.com. They have several binding posts. Since yours are broke, etc, you should be able to pass a non-Klipsch pair through the holes where the originals went. You might be able to clip the solder as close enough to the old terminal point to get a crimp ring on the new post end without having to resort to the soldering next to that crossover circuit board.
He has truth; the wheel of time may roll whither it pleases, never can it escape from truth. It is important to hear that such have lived. All Hail Hypno Toad!!!