> The thread is a 14x1.25. same as spark plugs. ***Hmm. That sounds like the thread pitch of the front O2 sensor, the larger one. The rear one is a lot smaller than the front one...kind of like the front O2 sensor on a Bluebird ot GTi-R DET. Thanks for the tip, ===== Jay Whitely Tampa, FL 1996 200SX SE-R GTi-R powered, F-MAX Stage 2