[olddog]

I suggest contacting a Superformance dealer. If there is a way to get to it from up top, they should know how to do it.

Here is another easier said than done thought. Build a cage that holds the entire IRS. Remove everything that is attached to the frame (those parts could be moved to the new cage). Repair any frame damage, but I think stripping would remove what is broken. Now the new cage would simply bolt into the existing frame. At least 4 heavy anchor points, the further apart the better. Obviously the cage must be designed to fit into the frame.

I see this as a way to beef up the entire assembly and make it more serviceable in the future when all that Hp finds the next weakest link. Also there is a hope that you may eliminate a handful of the next weakest links with the cage design and maybe never have anymore failures.