Make sure in addition to the Genuine BMW regulator, you use new clips (2) and new nuts on the clips (2) per window, otherwise you're just putting it together with one new part and other parts that are worn and have been updated.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards