Im getting a set of pistons made up for my e320, they have asked me to send in a sample piston. Id suggest you do the same, much less room for error that way.
Regards

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http://www.benzworld.org/gallery/pic...06101523AM.jpg
Present:
'94 E320C AMG-Crystal Cassiterite Black, '01 S320 CDI-Silver, '03 E270 CDI-Cubanite
Past:
'83 230E-White, '88 190E-Blue, '88 230E-Black, '89 300E-BlueBlack, '95 E320 Ele-Silver, '97 C180 Ele-BlueBlack, '97 C180 Sport-Alexandrite, '97 CLK200 Ele-Tourmaline, '98 E280 Avant-Amazon, '98 SL280-Zircon, '99 E240 Ele-Aquamarine, '99 CLK230K Ele-Silver, '99 CLK320 Ele-GreenBlack, '00 CLK230K Cabriolet-Quartz