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I have a pair of refurbished Brembo calipers they are Fiat coupe 20v which I think is the same as Mk 1 Focus RS . I never fitted them , as I bought a complete Caprisport kit , looking for 200 plus post .
You can make them fit many things if you make adapters. However the mountings are closer together. I've had them side by side. Even piston sizes are a little different.