The bumper beam mount studs on the 2013 BMW 128i are part of the factory bumper beam/trunk panel mount assembly. If they are not present then someone on the assembly line wasn't paying attention! The hitch installation should not have been completed if those studs were missing.
The nuts could have been cross-threaded on which would mean that the threads on the studs would have to be re-cut. Regardless to get the properly rated nuts for the hitch you will need # RHK. Enter the hitch number... view full answer...
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