Here is the rack damper:

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1CQ0J3JZ42561AJUE3&year=1983&make=MB&model=300-SD-002&category=All&part=Governor+Idler+Adj.+Pin

Here is the updated primer pump:

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1CQ0J3JZ42561AJUE3&year=1983&make=MB&model=300-SD-002&category=All&part=Primer+Pump