I just saw that this is the front bolts.
move the seat all the way to the forward position,
Sit in the seat.....I know it is cramped.
now pull that lever on the side of the seat......and put your back into it,
most have not been moved in years so it may be difficult.
now move the seat back again with the lever shown in your pic.....TADA

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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