The replacement pulley simply drives the existing supercharger at higher speed = more power. Sort of 'overclocking'.
If you don't have a supercharger, there's no pulley to replace and nothing to be driven at higher speed. In short, no you can't get a pulley for a C240.

later

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg