Sorry, I did search, and can't find the link for that official document that one can buy that has details about your car from the factory. I searched here and at bmwusa.
BMW offers it for historic cars and motorcycles....
BMW Certificates of Authenticity
The company archive also offers owners of historic BMW models the option of ordering certificates of authenticity. These certificates are made of forgery-proof paper and list individual specifications along with the exact completion and delivery date, the engine and chassis number and - if available - details on equipment levels of the relevant car or motorcycle.
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