107 Subframe Reinfocement

I;ve read that there's a repair/reinforcement kit that can prevent the subframe of 107 from cracking, but I can't seem to find one listed on the net. Does anyone happen know where to get one of these kits, or a
work around using common brackets or sheet metal.
Any help on this would be greatly appreciated.
(BTW, according to MB this problem doesn't affecs 380's , but some 380 owners have apparaently found out otherwise)

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