Part number on EPC is #111 640 57 71 and is the same for all 220, 250 and 280 models. Mercedes sites show that it is still a good part for $2000. May be able to find a used one in a salvage yard. Might check with Classic Center and see what they have.
BTW, anybody who has these cars and is restoring, really should subscribe to the EPC or Mercedes Xentry parts information site. That is where all these part numbers come from.