"Most" of the time the rear section of the driveshaft is the problem. You can buy the rear section by itself. MB part number 201-410-23-02 with a list price of $595. wholesale price is $476.
I tried D/L/S service here in ATL & they did a TERRIBLE job. Had to go back 3 times as the balance was incorrect. R & R drive shaft 4 times to get correct balance isn't cost effective.
The front D/S balancer can be replaced, but on MY 3 cars the balancers are removed.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)