Be inquisitive about which key blade type you have. Early BMWs (old style & new diamond shape style) may have the notched (I believe HU58) key blade which is like the one on the right in the image below...which is my 97 e38's remote key.

The later key blades are not notched (like my e53's key on the right in pic below):

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• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)