2003 w32 O2 sensor part number?

[thefuzz4]

So we just got a N2U W32. The check engine light was on when I got it showing a 0131. Used you guys to diagnose this and I cleaned the MAF really good. However, this coffee is still firing on the same O2 bank 1 sensor 1. We live in Denver so going to need to get emissions done on this here soon so I can get plates. I picked up what I thought was the correct sensor yesterday but turns out it's not. Can anyone tell me what is the correct part number for this? When I go into the store they have a hard time finding it in their system so I just went work what my gut thought works work and what I found online

[onlakegaston]

This is the part number you are looking for:
workhorse part 12572706 / or GM part 12572706