Hmm well if yours is 15mm, and mine is 3/4" (whichis almost the same as19mm), then maybe we have some component difference between years or something. Keep in mind, when I went to Oreilly Auto Parts and asked for a "2004 Dodge Neon 2.0-liter upstream O2 sensor," the one I got was the exact same size as the old OEM one that I removed... in fact, the new one was a Bosch but I can tell you it looked like it was made in the exact same factory as the old one... the die marks were the same on the insert. 3/4" old, 3/4" new. Not arguing, just pointing this out for everyone so any of you who go to do this, might want to get down there and check it before you go and swap it.

 

guess not, they fit like a glove! thanks to everyone for the info, I will post pics soon!