10x said:B Square makes Lynx rings that will fit the baces. I believe they are 11mm baces.
There are also Australian rings that will fit.
http://www.google.ca/search?hl=en&q=lynx+scope+rings&meta=
The Brno #1-#5 does not take 11mm rings. Although some of the newer CZ's and Anschutz's uses the 11mm size. The Brno #1-#5 takes 16mm (5/8) unless it's a hybrid from the 70's that has both CZ and Brno parts put together to make a gun from when CZ took over their sister company Brno.