"From an ‘83 to ‘92 4 cylinder or 3.0L V6 Ranger/Bronco II with a 7.5″ rear end you will need two driver’s side axles. Only the driver’s side will work as the pumpkin on these rear ends is offset and the axles are different lengths (you need the longer of the two axles). It should measure 29-5/32″.
From an Aerostar you will need two of the passenger side axles from an 86 to 97 model.
The axles are all the same so they can be mix-matched (i.e. – one driver’s side axle from a Ranger and one passenger side axle from an Aerostar)."