It is in the trunk, usually found on the left side, towards the wheel arch. I believe with your model there is a small plastic panel that is opened for access to the motor and its manual closing nut. The nut I believe is a 17mm.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)