Hi AnonyMouse,
I know this has been answered already, but just wanted to add a little info. The disks OWC sells has been brought up to the moderators before. Unfortunately, Apple can't really do much to stop them. They are not an authorized Apple reseller, so aren't under the same rules as those who are. Where OWC gets hold of so many machine specific disks is another question.
Anyway, as noted already, Panther was
never released on DVD as a retail "starts any Mac" product. If you find Panther on a DVD, it is
always a machine specific copy. Their CD version is no better. Choose the CD version in the pull down menu on the page you linked to. Then scroll to the bottom of the resulting page. You'll see gray, machine specific disks. Definitely not retail disks. Heck, if you click on the image of the disks to enlarge it, you can even read that they're for an eMac.
While I have purchased a fair amount of hardware from OWC and been very happy with it, they've got a lot of nerve selling those disks as retail copies.