As promised here are pictures of the two sensors I have. I'm not sure when I got these, where they came from, how much I paid or what part numbers they are.
I do not have GM boxes for these.
Each one has markings just above the threads.
The NOS one is visually perfect. Markings read AC-85M-220B-253M. Asking $95 shipped to any continental US address.
The used one has some light wrench rash. Markings read AC-95M-230B-253M. Asking $25 shipped to any continental US address.
