I can't help with the part numbers, but I can tell you that I recently was having problems with the front sensor on our '95 854T.
I pulled the sensor and cleaned it by soaking in gasoline and gently scraping the crud off it.
Put it back together and so far (though only 500 miles later) there's no code. And the car seems to be running smoother.
I guess what I'm saying is maybe it's worth trying to clean your existing sensor.
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"Differences of opinions should be tolerated, but not if they're too different" - Sharon Craig
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