One of the advantages of the 126 is that the passenger and driver's seats are identical. Find a good passenger seat from a junkyard 126. You cna always swap yopur cover onto the "new" seat if the "new" one doesn't match. MB Tex abd Leather are different, so you need to pay attention to that.
I don't know where you are located, ( put it in your profile), but in the Balto, MD area there are a series of U Pull it yard. Price lisy is published so you know the price beforehand. Bucket seat with motors is about $55, or so.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags