It would probably be easier to buy an entirely new caliper. That way all you need to do is swap parts, put everything back together, bleed the brakes, and you are done. Calipers are not very expensive if you are putting a new stock part on it. It can get expensive if you want aftermarket calipers.
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'98.5 Mystique GS ATX/re-contented door lights/K&N Filter/Energy Suspension Sway Bar Bushings/Mintex Street Pads/universal-fit sidemarkers/Pioneer DEH-P3100 receiver/Pioneer TS-A6855's in all doors