The rings needed depend to some extent on the scope you have. What is it?
In case readers are wondering, CZ (and other rifle-makers such as Anschutz), use 11mm dovetail grooves on all their 455 models.
If it's a 1" tube scope, with a 42mm objective, you can use Warne 7.3/22 high rimfire rings. Amazon.ca sells them under the moniker "Warne Scope Mounts 22 High Matte Tactical Rings" for about $35 - 40. There are, of course, many other rings to choose from, including BKL, Burris rimfire, Sportsmatch, and if on a tight budget UTG Accushot Premium Mid profile airgun/22 rings for $19, available at Amazon and a very good bang for the buck, so to speak.