Here are some posts I have made. They may not be 100% accurate, but hopefully it would be a help to you.

Help! 1994 600SEL or S600

W126 VS. W140 (420 sel, S420)

Andy Kuo

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1992 Mercedes-Benz 400SE
http://members.shaw.ca/AKRY/W140_Side.gif

2002 Acura TL Type S
http://members.shaw.ca/AKRY/type_s_side.gif