I went with the TUV approved, German made H&Rs....

H&R 30mm wheel spacers for BMW X5 BMB60757252 | eBay

These are mag/alum alloy, hard anodized (available in silver too).

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!