Replacing the city/parking bulb (H6W) on my 2001 E320 4matic,it seems there is no way to secure the bulb and socket into the receptacle. I'd guessed there would be a clip or a way to twist or thread it in,but not that I can see. (note: I'm NOT referring to securing the BULB into the socket; I asking about the SOCKET into the receptacle). Thanks for any help and advice!

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2001 E320 4matic, 2003 E320 4matic wagon