Has anybody actually tried fitting them to a Suzo? The wheels were originally sold as being only for Betson trackballs. Then somebody tried fitting them to a Happ, and whaddaya know, they worked! I have not verified, but I am 99% sure they'll work in a Wico TB as well. I believe Wico manufactured the trackballs for Atari, so they may fit those as well. Not including the Missile Command / Football 4" units, those used a cup-shaped encoder that would definately not be compatible.
They may work fine on a Suzo, we just need somebody with a Suzo/Ultimarc TB to make the experiment.