How do you replace the lower ball joints on a 2000 windstar?

According to Autozone.com, you must replace the whole control arm. Here is their procedure:
NOTE do not begin the removal procedure unless a new strut-to-lower arm nut, a new ball joint pinch bolt/nut and a new lower arm-to-front subframe bolt/nut are available.

1. Remove or disconnect the following:
   NOTE
   Do not use a hammer to separate the ball joint from the front wheel hub and spindle.
   
   
   
   WheelsLower arm strut nut and dished washer. Discard them.
   
2. Place the steering wheel in the unlocked position.
   NOTE
   Do not allow the halfshaft to move outward. Over-extension of the halfshaft joint could result in separation of internal parts, causing failure of the halfshaft joint.
   
3. Remove or disconnect the following:
   NOTE
   Use extreme care to not damage the ball joint boot seal.
   
   
   
   Lower arm ball joint nut and pinch bolt. Discard them.Lower arm from the front wheel knuckle
   
   
   
   Remove and discard the lower arm-to-front subframe bolt and nutRemove the lower arm from the vehicleTo install:
   
   1. Install or connect the following:
      
      Lower arm strut into the lower arm rear strut bushingLower arm into the front sub-frame bracketNew lower arm-to-front subframe nut and bolt. While holding the lower arm horizontal, tighten to 85-97 ft. lbs. (115-132 Nm).Ball joint stud-to-wheel hub and spindle, making sure that the ball stud groove is properly positioned.New lower arm ball joint pinch bolt and nut. Tighten to 46-52 ft. lbs. 62-71 Nm).
   2. Clean the lower arm strut threads to remove dirt and contamination.
   3. Install the dished washer with the dished side away from the lower arm rear strut bushing.
   4. Install the front suspension lower arm strut-to-strut nut and tighten to 85-97 ft. lbs. (115-142 Nm).
   5. Install the wheels.
   6. Lower the vehicle.