Why not drop Tom a short note, he is most helpful.
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
I guess you would have to fax him proof of ownership, some details on your car. Fax him your data card if you have it. If you don't have a data card for your car he can provide one for you from his data base. As said Tom is very helpful and if I was in your situation this is what I would do.
Good luck and let us know how you make out.