You need the whole caliper, or the part that the brake pads go on. I believe that part comes off the caliper, by just unscrewing the bolts. Not sure what exactly you can't get off your car, and what will make it work.
That's the peice the caliper can pivot on right? to flip it up to change pads? I got new ones (although for an Escort GT). I went to Napa and bought a hardware kit. I think it was anyway. Theres two different ktis you can buy.
Ask for a hardware kit for your car. Get them to bring it over and open it. See if it is in there. If not, ask if they have any other kits. Maybe a caliper rebuild kit. not sure if that's what it's called. I've bought both, and it was 9 for one, 12 for the other. Go to an auto parts store. I went to napa.