No picture, but on my 124 300D you just remove the bottom of the rear seat (achieved by pressing on the red tabs at the bottom front of the seat) and it'll be right under some sound deadening material. It's on the passenger side as Jeff previously stated. It isn't difficult to get at at all.

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Dale

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1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel