About these spark plugs, except that they seem to be favored by VW and BMW drivers. I did find a link to a company in Anaheim: http://www.eurosportacc.com/html/ignition2.htm
Perhaps sending this thread over to Performance Paddock would be more appropriate? This is a 4-X electrode plug similar to the Bosch Platinum+4, and I seem to remember reading somewhere on these forums that those weren't all they were cracked up to be.
Here's a link to Beru AG: http://www.beru.com/e/products/index.html
They make a wide variety of products, even including Glow Plugs and Diesel fuel injectors.
I have not found any specific application for Mercedes. You need to go to the BERU site above, and enter your information for them to match the plug model to your car. Then call the guys in Anaheim?
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