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tire size?

Model: 911T, Year:1972, Mileage:80,000, Type of use:Both Street & Track
1972 911t, original owner put on 195/60R15's. Wrong size and effects the calibration of the speedo. Owner's manual states "optional 185/70VR15 on wheel rims 6 J X 15 only. Is 6 J the Mahle wheels that are OE on my car?

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