i have been looking for o2 sensors for my 01, I'm going to replace the bank 1 sensors to try and getrid of ses light. bank 1 is closest to firewall, iirc. I found them at rock auto, but unsure which ones to get.
http://www.rockauto.com/ catalog/ racatalog.php
Here's the link.
Thanks

 

I needed those once too and just simply called them for more info
also the easiest way is to check with this image

 

go with www.ngk.com

they have lasted 100K on my car...