These are the rings if you scope a Lux. They're lower, cost less, and are sturdier than the CZ rings,...and have the proper size dovetail.

http://www.airgunwarehouseinc.com/py-a-1934.html

I mounted a scope with a 32mm objective lense on mine with these rings, and with the rear sight all the way down, there's about 1/16th inch clearance between the scope and the rear sight,...about as perfect as it gets.