Whenever consumers need to complete a simple automobile maintenance task, such as replacing windshield wiper blades or an air filter, they just need to run over to the local Napa Auto Parts, Auto Zone, or O'Reilly Auto Parts store, buy the product, and install it. On some occasions, I've discovered one store might not have the part, but another will probably have it. But on other occasions, when I'm having car repairs, a mechanic might not be able to find an auto part locally and needs to have it shippe ...