As far as I know. I know you used to be able to. With these new auto parts stores, they might have quit selling them. Kinda like the old service stations. They used to check your oil, check the air in your tires, and fill you up. Now we pump our own gas. It is worth a try.
Another thing to think about is seeing how close Ranger or the 1996 to 2001 Explorer calipers are. I know they use the same brake pads. As far as I know, those that have did the Ranger Edge spindle swap used the Trac's calipers, but had to use Ranger rotors.
Might be worth a try.
If the caliper isn't leaking or anything, you might just as well order the calipers and wait for them to come in.
Tom