It is a 3 digit code, on the left column of numbers. You might want to use one of the online VIN decoders that will show details of the original vehicle
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It's desgined to handle European and Asian MB VINs. To convert a North American VIN here's the procedure example
WDBCA24D6MA599620
to
WDB1260241A599620
Copy your VIN to Word. Delete everything between the B and the A. Put a 1 in front of the A. Insert your car's chassis code between the B and the 1. Copy and paste the converted VIN to the decoder. Once converted the ID will work.