BMW X3M/X4M upgraded diff bolt kit

Kit includes:

* 12.9 grade 14mm bolt

* Class 6 fine pitch Nylon insert Nut

* High quality 3mm thick Zinc plated washers

Our upgraded bolt kit is 25% stronger than the stock BMW 10.9 grade bolt

Installation takes 1hr

BMW X3M/X4M F97 F98 upgraded Diff bolt

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