I have a 1997 E320 with a defective speed regulator for the ventilation blower. I have checked with MB dealers and indepentant MB repair shops only to be told that the regulator is not made for this model of E320 now. I was told that I would need a new blower and regulator. Does any one know where I can find a regulator that will fit a 1997 E320 ventilation blower?