IF you had the W/S wiper insert replaced at the dealer then they THROW away the metal strips!! USA dealers use a insert(cheap) made in Mexico by Trico. THEY have a plastic guide built into them.
YOU can't buy the metal strips. SO either buy a new complete blade OR go back to dealer & ask for the metal strips back from one of the service people OR buy one of their inserts again!!
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)