These are OE replacement oxygen sensors new from AC Delco. AC Delco part numbers are AFS-97 (GM number 25312196) for the right side (passenger's side) and AFS-98 (GM number 25312197) for the left side (driver's side). Both part numbers are for pre and post converter locations. If you are looking to change all locations, you will need to order 2 of each part number. Shipping is via FedEx Ground Home Delivery based on your zip code and will show the amount in checkout. USPS AirMail is available for customers outside of the continental US. Email me for shipping charges outside the US.
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