Any CZ hi-cap will work in the P-01 (or Compact, or PCR), but will stick out about 3/4th of an inch.
CZ makes hi-cap mags for the P-01/Compact/PCR model, 13-rounders, flush fit. They're pricey, but they can be found.
Don't know of any other mags working -- the Magnum Research compact mags do NOT work in these guns. I bought one as an experiment. They're too short.