The flange the wheel bolts to is actually a few mm bigger than stock.
Some BBK rotor hats do not fit on that particular flange. The distance from the wheel bolt holes to the outside of the flange is noticeably smaller on the stock bearing than the FAG bearing. Turns out a friend had an SKF bearing for the car, replaced it tonight.
Someone really reefed on the nut though, way past 214 ft/lbs based on where it was staked vs where it is now.