2000 MBZ SL500 Upstream Oxygen Sensor

Can someone provide information or even a picture of where to locate the Mercedes Benz SL500 Upstream Oxygen Sensor ?  I found what i think are the downstream sensors which are very hard to get at, but not the upstream ones , thanks all.

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MBFanatic made a comment.
11 months ago

Right before the cataltyic converter. Yeah, they are hard to get too as well. 

o2 sensor

 

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