Remove the C-pillar trim, the rear seat and don't forget the nut in the trunk.
Pictues are here, Group 68, section 449 and 458:
http://mb.braingears.com/126_DISC1/program/chassis_300SD.htm

Be sure and read C-pillar removal carefully. The angle of removal is tricky.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)