If I was you I would forward my request to Tom, H (see below) Include your Vin Number and Transmission Number (should be stamped on your transmission or your data card.
If you don't have a data card Tom can provide it as well. Should you need a data card for your car then e-mail Tom 1) a photo of your car, 2) copy of your driver licence and 3) a copy of your ownership. Item 2 and 3 you can photograph it and include it in your e-mail to Tom.
His Contact info is as follows;
Tom Hanson
Supervisor, Parts Operations
Mercedes-Benz Classic Center USA
MBUSA, LLC
9 Whatney
Irvine, CA 92618
949 598-4842 direct
949 598-4870 fax
Thomas.hanson@mbusa.com