If its from your car...something that size should have either a 7 or 11 digit BMW part nbr on it...or at the least the BMW acronym or Roundel. If it does have the part nbr on it you can look it up at realoem.com.

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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)