Update on this, since
@EndlessPlaid didn’t come through…
I confirmed with Tesla, that this part is the most current part number for the refreshed S models, so it should be the airbag horn module Elon mentioned is in all cars produced since November.
Actual Telsa response was -
“Thanks! It does look like the part we put in is the newest available revision, so I think chances are good. I don’t know that we’ll know for sure until the firmware that he references comes out (I have no idea when version number or when that will be, however).
Thanks!”