Ford 9" in 1965 Barracuda...an option?

The lug pattern of a bronco is 5 x 5 1/2, so I don't think you'll be able to find wheel adapters to the 5 x 4 pattern. The axles could be redrilled, but I believe the hub in the center is not going fit your wheels.

If the 9" is really cheap it could be narrowed and new axles ordered with correct bolt pattern. Would probably be a lot less than finding a completely built A body 8.75.