On a US bumpered car, it can't be done without removing the bumper - somewhere on this board, this is described. Even though it's made of aluminum, it's still heavy, so this is a two-person job if you don't want anything to be damaged.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm