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i dont think its for a cayenne turbo as the guy told me they were on a carrera
it looks like gt3 calipers..
996.351.428 for the rear
i cant get any other numbers
Above part number doesnt exist in any part list (boxster, 996, gt3, turbo, cayenne)
probably you got the last digit wrong.
Also the ZR18 appears in Cayenne brakes but cayenne brakes start from 955 as Dell said 955.351.421 / 955.351.422.
If the last digit changes they can be from a carrera namely the 4S or turbo or gt3 mk1 if last digit is a 9 and from a boxter S if its a 5.