The easiest thing to do, if you have the original papers with the car, is to check in the warranty (or maintenance?) book in the back and look for a piece of paper called the "wartungsheft" (warranty sheet) has all the numbers for things like this incl. the engine numbers. Barring that I am not toally certain where the engine number is stamped into the block. Possibly behind the left cylinder head on the deck of the block.
Gilly
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