I would consult WDS and identify the wire colors to be sure. Check the ETK to see if they might have different part numbers. TIS might call them out as well. I'd guess the front one is #1 and the back is #2.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim