Willy,

There are 6 bolts: four on the back edge (license plate side) of the trunk, just above the carpet line, are plainly visible. The other two -- one under each tail light are accessible after you remove the back of the tail light, as you would to change bulbs, then peel back the fabric liner.

My understanding is that the bumper then slides back and out.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black