W124 seat removal
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mercedessource Tech help - The seat has to be able to move back and forth in order to remove it! There is no other way (except to cut it out) to remove a front power seat than to move it all the way back to get to the front hold down bolts and then move it all the way forward to get to the rear seat track hold down bolts. If the seat won't move you have a problem. Watch Kent's free intro video ...
The front seats on your W123, especially the driver's side, have seen a lot of use over 30+ years and usually hundreds of thousands of miles. It's not unexpected, therefore, to find that you might have saggy foam, broken springs, stuck seat rails, broken seat handles, torn fabric, cracked leather, or torn vinyl, or a host of other issues.