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If it’s like a W212... first, remove the lower seat cushion which is snapped in two places on front edge to body. Pull up each side with firm yank and slide forward the out the door.
You should then see a wire loop below that side bolster with a screw securing it to the body. Remove screw and then the cushion is pulled, yanked towards the front of the car. It’s also snapped into place in a few spots.