OK, to answer this myself:
The driver side is 28", and the passenger size is 17", although 18" seems to actually be a better fit.
Now, how about height? I bought a set of Goodyear wipers and they are quite "tall"... about twice the height of the OEM units.
This causes the arms to stand quite a bit higher off the windshield. While it doesn't cause an clearance issues with the edge of the frunk lid, it does impinge on driver sight-lines... and also would seemingly be worse aerodynamically.
What are folks preferences for low-profile wipers?