Alright I Just Installed My Headers Last Night On My Truck But When I Finally Got The O2 Sensors Out All Of Them Had At Least Some Of The Threads Messed Up On Them And I Dont Know If I Can Use Them. Also Are All 4 Sensors The Same, Can I Use The Rear Ones For The Ones That Go In Front Of The Cat, Cause They Are In Better Shape. Ive Got The Nelson Tune To Due Away With The Rear Ones So All I Need Is The Front Ones. Help!!!!
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I believe they are different. Just look at the side of the body, they should have the part number engraved. Same number means same part, and vice versa.

 

All four sensors are the same.

I had to replace 3 of mine with my header install since the threads stripped.

 

YEP I FIGURED THAT OUT YESTERDAY BUT THANKS ANYWAY.