You are correct regarding the spelling of "Stucki", the firm that produced side bearings for freight cars. Thanks for catching the error and making the correction. Never try to spell something when it is 3 AM in the morning.
You will find that there were at least six other firms making side bearings with rollers, some with single and some with multiple rollers. There were plain side bearings without rollers and one design that was a rocker (with a "T" shape instead of the roller) side bearing. You can find these in the truck parts sections of most Car Builders Cyclopedia's.
Thomas M. Olsen
7 Boundary Road, West Branch
Newark, Delaware, 19711-7479