http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1WO126AB91X60RGWH9&year=1998&make=MB&model=S-500-003&category=All&part=Spark+Plug

Is this the new plug Bosch spec's? Anyway give Phil a call maybe he can get his hands on some old stock.

Also try your local MB dealer, they sell plugs for cheap! I think I paid $2 each for the last set.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200