Hi Antony,
I see you found the right spot to post your question. As I mentioned in my e-mail to you this is the best way to get help.
Contact Tom by e-mail see his contact info below. You need to send him a copy of ownership before he can send you the Data Card that should then show both the VIN and Motor No's
Tom Hanson
Supervisor, Parts Sales
Mercedes-Benz Classic Center USA
949 598-4842 direct
thomas.hanson@mbusa.com
Good Luck
Dieter