No idea...but since our cars are a similar vintage, and lots of my W115 parts have W116 on them, I would think there was no mounting place.

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1976 300D
190,000 Miles
Colorado Beige

1975 300D
Parts Car
78,000 Miles
Rustbucket
Also Colorado Beige

1984 190D 2.2 (Dad's)
156,000 miles
Champagne Metallic Clearcoat