you get what you pay for.

I agree with the above. The outer joint boot kits are 14 bucks apiece from Pelican, GKN Loebro brand which is OE, just not in BMW box. Get 2 kits one for each outer side, and you can buy a new outer joint from the dealer as TriX5 mentioned. I would do that. Don't go cheap and put in chinese junk just bc 1 of the 4 cv joints needs replacing up front.

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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