I would say look for a used seat in good shape and put that in. I don,t know if the upholstery is reversable from right to left. If so, it should be easy to find a passenger's seat that you could take the seat covers off of and put them on your seat. It seems that 80% plus of the W123 interiors after 1981 were Palomino.

The photos were not there when I did my reply. I had a 1976 BMW 2002 that had cloth inserts and they were trashed. I took the upholstery off and found a close match to the existing cloth and reupholstered the seats myself. I would start out by trying to google some German automotive upholstery supply places to see if they have the correct cloth. I checked around a bit and found nothing, but did not go to any German sites.

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Doug

1987 300TD x 3
2005 E320CDI