I have a used AEBS header that we got for my brother's car. IT looks the same as mine but his O2 sensor wouldn't thread in. His O2 sensor was larger than the header fitting. His O2 sensor is assume is 24mm and it is a really old and original one. Did the SR20 go to a smaller 22mm O2 sensor later? Do I have to drill it out and tap it to 24mm or can I buy a 22mm threaded O2 sensor?

Brent