If you want to go cheap try getting a passenger seat from a salvage yard. You can swap the bottom half of the seats. Passenger side typically is empty most of the time so may still be good even on a high mileage car. I paid $50.00 for the whole seat.

By the way, I've got complete dark brown MBtex seat cover (top and bottom) and matching head rest. Was right front seat in a 1980 240D. Very good condition. $15.00 plus shipping - not doing me any good here!

fred