What kinds of AirPort card work in a 2005 eMac?

I got an Airport Extreme (old UFO looking model) at a thrift shop today for my grandpa so he can get an iPad, but I also want to upgrade his eMac to be Wifi capable. It's a 2005 super late model, emc #2057. I was looking at 1999 AirPort and 2004 AirPort extreme cards in that thrift shop too so which ones can work? I just want to do this so he can have an iCloud account and use both of these great Apple products together,