The 4500 was actually an HP printer with Apple's name on it. Following is the Apple number and the HP equivalent that you can buy just about anywhere.
Cartridge - Apple # - HP #
Black Ink - M5693G/A - 51629A
Color Ink - M5694G/A - 51649A
Color PhotoGrade - M5692G/A - C1816A
[ 01-16-2002: Message edited by: Paul S ]