Just an FYI - while working on the cars today, was able to take this picture comparing 17mm vs 19mm bolts. My e86 Z4MC uses 17mm (88 ft-lbs) while the e53 X5 uses 19mm (101 ft-lbs). The diameter of the 17mm is 10mm and the 19mm is 12mm. I'll let you decide if you think the 17mm is safe to use on the e53.

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2004 X5 3.0i
Born 02/04
Delivered 03/04