Its an aluminum bolt supposedly, and I'm not sure on the plate its pretty heavy iron though. I did it this way because my subframe was only torn from one of the four points, so instead of taking everything down for one mount i found this to be a better solution. Either way as much as it pains me, ill be looking into a g in the near future. Bmw may have great quality engines trannys and interior but this issue has really showed their "german engineering" to be A plus (sarcastically)
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