quick and dirty is with front bolts removed tilt the entire seat back, bending the floor track so that you can now get a wrench or socket on the rear bolts in from the sides (side meaning from the center toward the outside). The floor track can bend back nicely when out of the car. You may be able get a wrench or socket in from the sides of the track on one of them without using the grunt method.

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon