I have seen them on one type of /8, the 115 300D. Both of mine have that trim, but none of the others I've seen. They are '75 & '76 models. My '79 SD doesn't have it either.

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H.D.B.
OBK #45
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'75 W115 240D, wife's dd, 197K
........'75 W115 300D, my dd, 245K
.. .. ..........'82 W126 300SD, the 'someday' project