This happened not too long ago. For some reason, it is listed for the w126's but not the w123's. Try this:http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1V61D44OW1V61D4BO7&year=1983&make=MB&model=300-SD-002&category=J&part=AT+Modulator+Cap

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Sam

84 300SD 350K+ miles ( Blue Belle )