L-rear quarter panel. I don't remember an indentation being there from factory on the W126? Had to have been a fairly good whack from something, as the metal is really solid at that part of the car. Pictures can decieve. That dent probably looks bigger in 3D.

$8K sounds resonable.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)