Here in the US you can get the BALANCER for the driveshaft & many times that is the problem. Or you can try removing the balancer to see if that is the problem. ON my racecar I removed it over 4 years ago & no problems even at 130mph. There are several DIFFERENT bolt circles on the flex-disc. ie; 80mm, 90mm, & 100mm. Let me know the size & I can look up the correct part number.
Is the center support in good shape.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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