Sandeep,
911 rotors has a different offset than any other Porsche.
As per the caliper mounting holes has the same distance.
I have done this a long time ago and IF I was remember RIGHT
you need to machine the inner mounting surface of the 930 caliper for about 5mm to fit correctly to it's own rotor...
I was have some pictures from my rears but no scanner here!
Rgds,
Jim
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