I finally found the answer. It seems the intake air temperature sensor was only utilized on Euro V8 cars in the W126. I'm not sure why it was eliminated for the U.S. market.

However, the important thing is that the duct itself is the same between U.S. and Euro cars. The port for the sensor on U.S. cars is sealed with a plastic plug. It can be removed with a bit of careful prying. I installed the sensor on mine and it fits perfectly.

I love being able to solve a problem for free!

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1998 E320 Wagon

1992 300D 2.5 TURBO

1991 560SEL M119.960

1986 300SDL TURBO

1992 500SL Parts Car

1991 420SEL Parts Car