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~el~jefe~ I'm not going to dig up the articles / videos I've read / watched to provide them to you. Life is short.
What I did do is go out to the garage and look at the AT '17 BRZ Limited sitting in it. It does in fact have the structural change to the rear wheel wells.
The front V-bar support looks identical to the one shown in the leaked internal pdf, but idk how much that matters since it's not clear how much "thicker" they made the mount.