Problem is that the axle you are gettin from NAPA for $66 is almost definitely a remanufactured axle.
Remanufactured are a risky thing. Some have had no problems, others say they get heavy vibrations from the front end at certain speeds because they are not balanced correctly.
It's not a risk I was ever willing to take so I buy new GCK axles with a lifetime warranty from AutoZone. $121 shipped.