Gunbug, I think Corlanes carries the Talley rings which is likely what I will be using on my Brnos. I am not sure what your dovetail width is but Talley makes them for the CZ527 and CZ550 I think. The 550's will fit my 21H and ZG47. Not sure for your 600 series but a call is all it would take.
Best of luck!
Noel