My present 300D had a similar dent when I got it.....but only the lower portion, below the trim.....I used a couple of wood blocks, and some wedges.....I removed the trunk/fender liner, cut a section of 2x4 to fit the inside of the dent......and a piece of 4x4 to fit inside of the 2x4.....and another piece of 4x4 to fit against the tire well/frame......and used some cabinet wedges......drove them in between the 4x4's, gradually increasing pressure on the dent until it popped out......came out well, but is noticeable if you look for it....the Dark Blue is unforgiving, as well as is Black......

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG