I have been in cars where the seat was leaning on the left and it was because the seat was worn out and needed new springs.

I have been in cars where the sides were even and the middle felt like it was hollowed out.

Neither is normal!

I don't believe any other MB seats will fit your 124. You may have better luck finding a used 124 passenger seat and having that converted to a drivers seat. It can be done in and hour and a half and involves moving frame rails, etc. The pass. seats "never" wear out and the drivers seats alway seem to.

HTH

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Brian Toscano