O2 Sensor extension for 06 chevy truck
 

I am needing a set of o2 extensions for a 2006 chevy silverado. I put longtube headers on and had to move the cats back and now I can't wire the extensions. I was looking at the casper extensions for the c6 corvette and 2010+ camaro but my o2s are a 4 wire sensor. Does anyone know what the 02 sensors on the corvette are? 3 wire or 4 wire or know where I can find a 4 wire ext? I am looking for the rear o2s which are the trapezoidal plug not the square plug

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Its not flat or square its a trapezoid shape. It looks like this http://www.casperselectronics.com/st...oducts_id=1269 but I have a 4 wire plug and I think this is a 3 wire plug extension.

There are 4 terminals in the plug you linked, so I would say that is a for wire. Look at yours and see if the terminals are in the same place.