7 sizes for 17″ to 23″ wheels, with the heights and widths their makers list.
Nominal widths from the size code.
13.2 inches wide (335 mm). The 335 only gives the width. Height comes from the rest of the size, so the 7 sizes of this width here run from 25.9″ to 30.9″ tall: 335/30R21 is about 28.9″, 335/30R18 is about 25.9″ and 335/30R20 is about 28.0″.
Some are. The 335 sizes that come out about 31″ tall are 335/30R23. 335s as a whole run from 25.9″ to 30.9″ tall, so check the full size, not just the width.
10 mm, or 0.39″ on paper: about 0.20″ more on each side.
The size code gives 13.2″. The widths the makers publish for the 20 335 tires here run from 13.5″ to 13.5″. Toyo publishes overall width; BFGoodrich and Michelin publish section width.