The Volare front suspension was used in the Caravelles, Diplomats, 5th Ave's, Lebarons with V8's up til 87. So there are lots of them still around.
Good on you for finding a Mustang II suspesion. Those are harder to find. The new mustangs now come with a similar suspension as the mopar. You can drop the whole suspension and motor from below now. I see these getting to be in use in the near future for our rodding projects.