I used the link above to check out the O2 sensors. Don't know if this matters but here is a note from the Ad in Amazon for the O2 sensor.
"Note: Bosch partners with other manufacturers to supply the parts your car was originally built with. This product is in a Bosch package, however the part may have been manufactured by an independent Bosch supplier. "
So does this make it a Bosch part or not?