Also available from Fast Lane for CLK 320, I did not see 1998 CLK 430 at all

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2A20YHZ2K2A20YIIWX&year=1998&make=MB&model=CLK-320-001&category=All&part=Spark+Plug

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE