Here are some pictures from my one 300SD's arm when we replaced it back in 2011:

http://www.peachparts.com/shopforum/diesel-discussion/303427-w126-trailing-arm-rear-lower-control-arm-rebuilt-replacement.html

Heres the pictures from the other 300SD... From January 2013 or so... also has pics of some of the rust and some sealing efforts.

1982 Mercedes 300SD Rear Control Arm Replacement - Imgur

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k