Thanks for the verifying the 17mm would be fine. Actually, the vehicle factory wheels were style 132 and the bolts are 19mm head. I got the vehicle CPO so the 19mm head bolts most likely are factory. Incidentally, my F86 with 21" factory wheels has 17mm head bolts. It sounds like 17mm head bolts is standard.
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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.
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