Where is the bank one O2 sensor on a Chevy Silverado 1500?

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I just replaced a faulty sensor on my 2004 GMC, and although not all trucks are the same, here is the correct answer for my application and probably most similar vehicles (Tahoe, Sierra, Yukon, Escalade, etc) with the same drive train 4.3/4.8/5.3l.

The system is setup almost like you would expect:
Bank 1 Sensor 1 - Driver's side, before catalytic converter
Bank 1 Sensor 2 - Driver's side, after catalytic converter
Bank 2 Sensor 1 - Passenger side, before catalytic converter
Bank 2 Sensor 2 - Passenger side, after catalytic converter

I searched around forums to find this answer, but no one was for sure and couldn't find it in their Chilton's or similar manuals. I disconnected each one, used my engine code reader to see which error was thrown after disconnecting them successively, and through process of elimination came up with the above information.
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Where is the o2 sensor on 1995 Chevy silverado?

I had a hard time finding the sensor on my '95 Silverado as well. After diligently searching under the hood, I crawled under the truck and found it. It looks like a spark

Where is the o2 sensor on 01 Chevy 1500?

They are screewed into the exhaust system / pipes. There should be 4 of them and thay are about 4 inches long with a electrical wire hooked to them. Start at the engine where