I am not sure if they are the same, but am excited to here they might be.
I am searching for the left side body moulding as you describe.
(Left rear 1/4 body moulding).

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85 300D 3 pedal. Current project.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.