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ZD-11 or Beru must be printed on the GP. There are some aftermarket GP's that are known to break the tip off. Be sure to use antisieze on the threads, torque to 14 lb ft. Don't over tighten them.
Beru is the manufacturer and ZD-11 is the part number. Advanced or Auto Zone will carry them and they will be in a Motorcraft package. Any IH dealer will also carry Beru. "DO NOT USE AUTOLITE"