I just did it. move the seat all the way forward.
get in the back seat behind the seat being removed.
put your foot on the back of bench.
reach forward and pull up on lever on the side of seat.
push forward with your foot.
there they are

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project