Nechako, what kind of scope are you planning to use? I have an old set of Kesselrings and bases. They are not splitting rings, the scope would have to be a straight tube with a removeable eyepiece. They are for a Brno 21H, not positive they would fit but let me know if you want to try them.
Wholesale sport lists Brno rings, you could check there too.
Noel