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To correct the incorrect data:X5 e70 non M has 74.1 hub all around
X5M x6m and x6 non M all have 74.1 front but 72.56 rear.
Only the rear would need to be bored.
Fyi oem 19" e70/e71 wheels are also square.
Due to similar rolling diameters the change in speedo is hardly noticeable I wouldn't be worried about that
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