If this is this what you are looking at, it is very possible.

PART NUMBER SEARCH RESULTS WITH PRICES
Vehicle 1989 Mercedes Benz 560SEL
Part: E.H.A. Valve
Note: Bosch 3.437.010.040
Mounted on fuel distributor.
C2030-19800 E.H.A. Valve Bosch IN STOCK $272.40

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1VE10RDJ21VH18GGU2&year=1989&make=MB&model=560-SEL-001&category=C&part=E.H.A.+Valve