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ok according to oemdodgeparts.com the 03 upstream o2 sensor is different from the 04-05 one so which one do i use i have the 03 mag intake and exhaust so would i use the 03 sensor

Use the one that matches your model year. The threads are all the same. It's the electronic part that count's. Since you have an '05 then go with the '04-'05 one. An '03 may not even connect to your harness, if they changed connectors.

an someone give me the pn for an 05 upstream o2