AW11 HELP::Rear Frame/Subframe Repair kit???

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Hello all, Quick intro for those who dont know me...My name is Ian, im from the New England area and have owned several AW11s... Enough about me and onto the car. I have rear rot in the frame rails. My question is this: Is there a frame rail replacement kit or rear subframe kit that is made for our cars or is there anyone in the area that does this as their specialty? If I am being confusing here is a reference of what I am looking for (although used on the 240sx) Xcessive Manufacturing