Totally get that. Stock X5 brakes are 365mm with single pistons vs X5m 395mm 4 pots I have for the front. I'd prefer matching X5m rears but as stated in my op it seems they can not be retrofitted. Therefore i'm seeking another alternative, stock rears will heavily throw out the balance but there's a good handful of folks running just retrofitted X5m fronts and are plenty happy with results, i'd prefer something little beefier to help aid aesthetics too.
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