If you are picky.. that might be a problem to find something you like.
I replaced my rubber base plates with plastic ones from Beretta.
They work fine with magazine's body, but are a little longer from the front than CZ's and require some work to line them ideally with front strap.
Beretta Part Number: # C57058
Here you have picture of mine after I took some material from the front:
The other option is to buy 15rd magazine from MecGar - it comes with plastic base plate.