The largest 3rd gen sway bars were the 36mm (not 34) front and 24mm rear.
There had been some talk about the 1984 15th Ann T/A having a 25mm rear bar, but have never seen proof of this.
Just remember this, sway bars have to be paired up as a tuning tool to your suspention, and bigger is not always better.
If you put too big of a bar on the rear without upgrading the front, your car will push, or understeer. Too small of a rear bar will make the car loose, or oversteer.
Alot of times,guys will put different bars on their car to suite there driving style of auto-x needs.
It helps to understand what you are getting, when changing suspention componants.
Leon