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Message: <blockquote data-quote="brwillms" data-source="post: 293107" data-attributes="member: 8859">I've searched for this and can't find any info on the forum.I have two bad O2 sensors on my car and need them replaced. I can get the parts for a significant discount from one of my employees who has a second job working for Oreilly.96 GTstock SOHC EngineI am finding conflicting information about O2 sensor part numbers. Mustangworld lists the 2 front O2 sensors as part # F5MF-9F472-AA. They then have different part numbers for the rear driver's (F6DF-9G444-AA) and the rear passenger (F6ZF-9G444-AA) sensors. I can only find one O2 sensor part that is a direct replacement at any of the major on line autoparts stores but don't know whether the sensor they have replaces the front or Rear O2 sensors on my car. All of these stores state that only 2 O2 sensors are needed. Am I missing something? The article on mustangworld specifically said not to mix the sensors up (article was on swapping to a MAC Pro Chamber). I have included a link to the article. The information is in step 5 of the article to the left of a picture of the stock and aftermarket H pipes. I really am concerned about doing this with the wrong sensors. What are the correct parts to use? Thanks in advance for your help.<a href="http://www.mustangworld.com/ourpics/fcar/hpip1.htm" target="_blank">http://www.mustangworld.com/ourpics/fcar/hpip1.htm</a></blockquote>