Are the o2 sensors all the same? I only have one on the whole car and its on the back side of the passanger header, can I just go buy one from GM or will I need a specific one?

 

Only one... someone must have stolen the one from the driver's side . Seriously, you have two, one on each bank of the engine. In stock form, there will be one screwed into the base of the driver's side exhaust manifold, and one a few inches below that point, on the Y-pipe on the passenger side.

My experience is that you get the best results from an OEM sensor... in this case AC/Delco. People who have tried the Bosch sensors have sometimes had problems. Do not go to a dealer... at least not your "local" one..... they will charge you $60 each. Contact Jason Cromer or Dal Slabaugh and get them mail-order for $35 each.

 

Ditto on what Fred said. Got mines for $35 from Jason.
http://www.97ta.com/misc_pic/misc55.jpg

 

Are there specific part numbers i'd need since I have headers?

 

Part number in the link.

 

No.... doesn't matter whether you have headers or stock exhaust.

 

Thank you gentlemen.