The only thing I buy at Auto Zone or Advanced Auto Parts is cleaning supplies. I buy all my real "car" parts from Napa. I learned that lesson many years ago. Really, saving $10-20 to buy some foreign crap is not worth it, as you have just learned. At least at Napa, the parts are excellent, and the guy behind the counter was not selling shoes, or working at Target last week like the guys at the other stores!