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Firstly, are you using the correct disc (rotor)? The turbo/non-turbo have different diameters, thickness and off set. If all is correct then shim them to suit. On our fitment of the 928S 4 pot calipers onto standard 944 discs i had to make a 4mm shim to centre the caliper. I also used plain washers on the bolts with thread lock as I didn't like the idea of spring washers onto the caliper lugs. Hope that helps.
Clive
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