E53 Trailer Wire Harness - Where can I get it?

[AC2717]

Hi All,
New to the forum because I just purchased a 2004 X5 sport Package/Cold Weather Package.
(I currently have a 1999 BMW 528i)

I have a trailer hitch from the previous owner, but not the wiring harness, only had bicycles on the hitch. I need the wiring harness kit.

I know the OEM part # is: 71 60 0 009 698
everywhere I go, ECS, BAVauto.com or dealers they are out of stock and it is on back order for i would imagine the foreseeable future

is there a aftermarket part out there that is plug and go that comes with the trailer module (basically exact same as the OEM kit)?? I was unable to find anything

thank you