Here is an update:
2.0T Sport, EX-L and Touring and 1.5T Touring: Rear Stabilizer is 16.5mm solid.
1.5T LX, EX, and EX-L: Rear Stabilizer is 16.0mm solid.
I found this on google; Eibach Sway Bar Kit (Anti-Roll Kit) 22mm thickness. Has anyone upgraded their rear sway bar? I know this was a sufficient improvement in the previous gen accord.