8 3/4 for 74 duster

Any year A (Dart, Duster, Barracuda thru 69, etc) body 8 3/4 will bolt in. They are getting hard to find, and correspondingly going up in price. The 66-70 B body rear is somewhat more common and cheaper, but the spring perches need to be moved and more offset to the wheels. Helps with running wider tires, slightly.