Power Mac G4 - AirPort card too big for slot
From Power Mac G4 MDD AirPort Card Replacement
It depends which Power Mac G4 you have.


  The Power Mac G4 Uses the standard PCMCIA AirPort card found in Macs from 1999-2004.





  The Firewire 800 Model uses an AirPort Extreme Card found in iBook G4's And 1Ghz+ iMac G4's.