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Hi Tlook,
The 944 turbo 220 HP brake calipers look exactly like the 964 front calipers, but they have larger pistons.
I put the 964 calipers on my '76 Carrera 3.0, over a 3.2 setup. The mounting holes have to be modified in that the lower mounting hole has to be ovalised. The spacing is 5 mm less on the 3.0-3.2 front strut. Some machine/weld the hole, I just filed it and put a big washer and longer bolt. No problem so far.
The 964 calipers suit the 911 better than the 944 turbo ones, as the piston surface is smaller, creating less bias to the front of the car when used with 3.2 rear calipers. The clearance is minimal, but it hasn't touched my 7X15 and 7X16 front Fuchs. 7X15 phone dial will work too, but not 6X15 phone dial. you may want to find 1992 vintage calipers as they have smaller fins/no fins on them, giving even more clearance.
My $0.02, GeorgeK
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