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Call Kinesis, they should be able to tell you exactly what you need, spacer wise. They could also tell you your options to have the rears reworked for the Boxster. That's one of the great things about 3 piece wheels.
I think your rears have a 65mm offset and with an 18 x 10 you would need something closer to 45mm so a 20mm hub centric spacer should do the trick.
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