An OEM wiring harness for the E53 just came up on eBay

2000 2006 BMW E53 x5 Tow Hitch 7 Way Trailer Connector Wire Wiring Harness | eBay

I have no financial interest in the auction and do not know the seller.

Mike

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Mike
Dallas, TX & Appleton, WI
2003 E53 4.4i Pearl Beige
2003 E46 330Xi Monaco Blue
2007 E90 335Xi Black Sapphire Metallic
2011 F25 X3 28i Black Sapphire Metallic