Thanks for the replies. I found the secondhand pump for only 40 euro, and it matches my model according to RealOEM. I'll grab that and try to build it in somewhere next week [emoji1360]

Still looking for answers on the key and mirrors!

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2002 BMW E53 4.6is - Estoril blue
1984 BMW E30 325 - Zinnoberrot
1964 Chevrolet Chevelle 300 - Meadow green