I have included an arrow that points to the stiffener plates(Square Hole Spacers) for the Curt Trailer Hitch Receiver # C11179 for your 1999 BMW 5 Series. Also I have linked below the installation instructions that will list all the components that should be in your hardware kit.
The hardware kit will include 2 of those spacers, 4- 3/8"-16 bolts, 4- 3/8" flat washers, 4- 3/8" lock washers, 4- 3/8" hex nuts, 2- 7/16" carriage bolts, 2- 7/16" lock washers and 2- 7/16" hex nuts.
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