I seem to spend way too much time looking for oddball scope rings in weird dovetail sizes. CZ and Brno in particular like to make it challenging by using several different widths on various models in their line-ups; what's up with that?
Airgun Source in Peterborough Ontario carries a good selection of Sports Match rings designed for assorted dovetail sizes, and their website does a decent job of explaining the different sizes and helping you figure out what you need. The Sports Match rings are alloy, not steel, but they definitely have a better-quality "feel" to them than many low-grade alloy rings and have become my first choice for dovetails on CZ, Brno, Tikka and many others. Most of them come with removable recoil lugs that either fit directly into the various slots and holes and other recesses on the dovetails of many centerfire and air rifles, or can be made to fit with a bit of judicious grinding, filing and/or squeezing. For rimfires the recoil pins are easily removed.
I've also noticed that standard Talley rings seem to fit very nicely on the 14.5mm dovetail on one of my Brno rifles; I don't use them on it because they lack a recoil lug and there is no easy easy way to add one, but on a rimfire (where no recoil lug is needed) they might fit the bill for you.