I am doing the 2016-2021 bumper refresh now on my 2012 Sig Red S. The swap is easy; just takes some time to gather parts. I'm in Atlanta, GA and would willing to help if you are close by. When I'm finished, I'll put together a list of parts needed for the swap. Most lists I have found are for later years (2013+) but none specifically detail what is required new from Tesla vs reusable from old bumper.