They fit the C6 Corvette. They are for upstream/primary oxygen sensors. Downstream/secondary/post Cat o2 gauges are different If you're making long headers this is what you want, I recommend going to Summit/Jegs and getting the insulation (1/2" x 4' good for 1400F) and prepping it of installation pretty easy, plug in the oem wiring, plug into the o2, start the car and let go of the bald eagles, exactly the same.
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