Your MB Dealership should have them in stock....or can get you one.....or maybe even one of their mechanics will have one in his toolbox......

You may also try a Yamaha Outboard Motor dealership.....Yamaha OB's use some "metric" Woodruff Keys, but I don't know if they have that particular size.....

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG