What rear axle to purchase and narrow

Dana67Dart said
If you decide to go with a Ford 9 inch you can get stock disc brakes if you look for a 70s 80s Versailles and loaded Granadas and Monarchs.

I've got one from my 71 Duster. Seriously, you don't want to use the brakes from those.

Somebody thought it was a good idea at some point, but after thrashing around trying to get a decent set of brakes of it I gave up and replaced it with an 8-3/4"