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there were several different versions of that size caliper
all 993 used the same version(not to be confused w/ the BigRed tt/RS caliper)
964 3.3t used a version that was different in that it has raised mounting blocks but is other wise the same as the 993 front
928S4 used 2 versions of that caliper very early versions had different pistons and seals, late were the same as the 993 versions. The big difference in these was that they are set up for trailing mounts, to use them on an aircoled cars w/ leading mounts the bleeds and feeds need to be swapped.
944t/s also used the 928/S4 version.
so to answer you question the o/s issue you are running into is not the result of anything about tha calipers. The rotor and caliper must have o/s that agree w/ each other. caliper o/s won't have much lee way because of the way the adapters are designed, but the rotor can have a large displacement depending on it's design and how it's mounted. The vender of the kit should be providing parts and info to help you.
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