Why not take off the wipers and get some black rubber plugs to fill the holes?
If not, you will have to get them from a junk yard if you want them the same color. Potomic will surely have them.
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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM