O2 Sensor Thread Size and Pitch Needed

[Opelmania]

I was hoping someone would be able to help me out. I need to know what the thread size and pitch is for the rear most O2 sensor. I don't think I am going to have to mess with the front most sensor, but if I have to, is that the same size? I am going to be welding a nut to thread the sensor into to make my job look as professional as I can. Thank you in advance for your help.

Joel

[D2Beetle]

I believe that the threads are the same for front and rear; are you putting in a custom CAT?

[Opelmania]

Kind of Frank. 2.25" pipe is replacing it and I'm hoping to keep the first O2 sensor where it is at and I'd rather not just tie up the rear one.

[D2Beetle]

All you really have to do is get an old rear O2 sensor and try to screw it in with just your fingers into the forward O2 spot, if it works, I would say they are the same.