Comments: 70000545 O2 Sensor w/ non-gold plated electrical terminals is no longer available and has been replaced by 70000719 O2 sensor w/gold plated electrical terminals. In the event an old style O2 sensor(70000545)needs replaced the customer must purchase new style O2 sensor(70000719) and a re-termination kit(70000720). This re-termination kit(70000720)will allow the new style O2 sensor(70000719)to be used with the non-gold plated parts and will include complete instructions. It is important that a part w/gold plated terminals NOT be used in conjunction with a part with non-gold plated terminals. Any engine built after engine s/n 3POL27055 will have the new style O2 sensor installed and this consult factory would not apply. Customer should order 70000719 ONLY if engine is already equipped with or has been updated w/gold plated electrical terminals.