My suggestion would be to contact Ricambi and get the caliper rebuild kit. Any competent brake shop should be able to overhaul the caliper for you. It would be a heck of a lot cheaper than buying new calipers (which I think are over $1,000 if you can find them).
Let us know how you make out if you look at the Porsche caliper, I agree it would be cheaper than a Ferrari one.
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