mb voltage reg 197-311-028 I got mine from ********.

These guys have as well http://www.naautoparts.com/m8_view_item.html?m8:item=1%20197%20311%20028%20-%20MB

This is the link to ******** http://www.**********.com/mercedes-auto-parts/mercedes-voltage_regulator-replacement.html

I actually ended up upgrading the alternator. Do a search here for alternator upgrade. The Saab alternator fits and gives more Amps.

Chris