My rear bumper has never sagged, but I bought some of SSFanBoy's rear bumper brackets anyway, just in case. After putting them on it turns out that like bargegeek my 2017 assembled in December 2016 came from the OEM with the revised brackets. No big deal.

I'm offering the originals that came with the car for sale here. To be clear, these are the ones that came with the car, but they ARE the updated design.

$100 shipped anywhere in the 48.