Macs before the Quicksilver 2002 all were capped at recognizing 128GB, so it'd be best to get a 120GB drive or a 160GB (you'd not be able to access the full spectrum but should get a little more GB out over a 120GB).

Intech's ATA Hi-Cap Support Driver allowed you to go over the limit with a custom driver and partitioning but it's probably safer to just find a 120GB.