AirPort Card For eMac

Hi, which AirPort card would i install to my eMac?
This one:
http://support.apple.com/kb/ht1621
Or, This one:
http://support.apple.com/kb/HT3024?

My eMac is the 1ghz model and is running OS 10.4

Thanks

Thanks, do you know where i can buy one from?
Thanks