You can get them for $2.17 from this site, that's what I use:

http://catalog.worldpac.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1CQ0J3JZ428X115U3R&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1983&product=E1000-11999&application=000016814