Pre B CZ 75 use these mags:Watch for mag compatibility. I ordered a surplus a year or so ago and it functioned with bmags but my understanding is that this was due to being a transitional model. AFAIK the 1st gen 75s did not function with current gen mags without modification.
CZ-USA 75/85 Pre-B 16 Round Magazine 9mm Steel Black - 11114 - 806703111148